Mailman 3 - Python-announce-list

Dr. Dobb's Python-URL! - weekly Python news and links (Nov 1)
by Grant Edwards 01 Nov '00

01 Nov '00

Guido van Rossum: PythonLabs Team Moves to Digital Creations http://deja.com/=dnc/getdoc.xp?AN=686714305 Randy Hudson nicely illustrate the event-listener pattern in the context of Jython as an extension language for Java http://deja.com/=dnc/getdoc.xp?AN=688152500 Moshe Zadka shows a portable locking mechanism http://deja.com/=dnc/getdoc.xp?AN=687180692 Thomas Wouters provides a pointer to another locking scheme http://deja.com/=dnc/getdoc.xp?AN=687318753 A.M. Kuchling reviews _Teach_Yourself_Python_in_24_Hours_ http://deja.com/=dnc/getdoc.xp?AN=687798879 Alex Martelli explains why slice indices work the way they do http://deja.com/=dnc/getdoc.xp?AN=688046177 and builds a primitive "use strict" before a live audience http://deja.com/=dnc/getdoc.xp?AN=687764895 then re-does it metaprogrammatically http://deja.com/=dnc/getdoc.xp?AN=687700793 ======================================================================== Everything 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 although PythonLabs.com bills itself as "The Python Source", which is becoming increasingly true in 2000 http://www.pythonlabs.com/ PythonWare complements the digest you're reading with the daily python url http://www.pythonware.com/daily comp.lang.python.announce announces new Python software. Be sure to scan this newly-revitalized newsgroup at least weekly. http://deja.com/group/comp.lang.python.announce Andrew Kuchling writes marvelous summaries twice a month of the action on the python-dev mailing list, where the future of Python is truly determined http://www.kuchling.com/python/dev/ The Vaults of Parnassus ambitiously collects 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 Consortium emerges as an independent nexus of activity http://www.python.org/consortium Cetus does much of the same http://www.cetus-links.de/oo_python.html Python FAQTS http://python.faqts.com/ Python To-Do List anticipates some of Python's future direction http://www.python.org/cgi-bin/todo.py Python Journal is at work on its second issue http://www.pythonjournal.com Links2Go is a new semi-automated link collection; it's impressive what AI can generate http://www.links2go.com/search?search=python Archive probing trick of the trade: http://www.dejanews.com/dnquery.xp?QRY=&DBS=2&ST=PS&defaultOp=AND&LNG=ALL&f… Previous - (U)se the (R)esource, (L)uke! - messages are listed here: http://purl.org/thecliff/python/url.html or http://www.dejanews.com/dnquery.xp?QRY=~g%20comp.lang.python%20Python-URL%21 Suggestions/corrections for next week's posting are always welcome. [http://www.egroups.com/list/python-url-leads/ is hibernating. Just e-mail us ideas directly.] To receive a new issue of this posting in e-mail each Monday morning, ask <claird(a)neosoft.com> to subscribe. Mention "Python-URL!". -- The Python-URL! Team-- Dr. Dobb's Journal (http://www.ddj.com) is pleased to participate in and sponsor the "Python-URL!" project. -- Cameron Laird <claird(a)NeoSoft.com> Business: http://www.Phaseit.net Personal: http://starbase.neosoft.com/~claird/home.html

1 0

[FAQTS] Python Knowledge Base Update -- November 1st, 2000
by Fiona Czuczman 01 Nov '00

01 Nov '00

Greetings, The latest entries into http://python.faqts.com regards, Fiona ## Edited Entries ############################################## ------------------------------------------------------------- Where can I best learn how to parse out both HTML and Javascript tags to extract text from a page? http://www.faqts.com/knowledge-base/view.phtml/aid/3680 ------------------------------------------------------------- Paul Allopenna, Matthew Schinckel, Magnus Lyckå Python Documentation If you want to (quickly) strip all HTML tags from a string of data, try using the re module: import re file = open(filename,'r') data = file.read() file.close() text = re.sub('', '', data) #Remove comments first, or '>' in #comments will be interpreted as #end of (comment) tag. text = re.sub('<.*?>', '', text) This will also strip any javascript, but only if the page has been made 'properly' - that is, the javascript is within HTML comments. If you want to know how it works, read the 're' chapter in the library reference, as it discusses the usefulness of 'non-greedy' regular expressions. ------------------------------------------------------------- How do I check and retrieve the error conditions & message of script executed via the Python/C API (without using PyErr_Print) http://www.faqts.com/knowledge-base/view.phtml/aid/6234 ------------------------------------------------------------- Kostas Karanikolas, Fiona Czuczman Alex Martelli See Section 4, "Exception Handling", in the Python/C API Reference Manual. PyErr_Occurred() returns a borrowed- reference pointer to the latext exception-type PyObject if any is pending, NULL if no error is pending; to check whether the exception is one you want to handle, pass this non-NULL pointer as the first argument to function PyErr_GivenExceptionMatches, second argument being the exception-type or class you want to handle -- it will return non-0 if matching. For finer control, you can call PyErr_Fetch, with three PyObject** arguments, for type, value, and traceback objects -- if no error is pending, each pointed-to pointer will be set to 0; else, at least the first (to type-object) will be non-0 (a reference will have be added to objects returned in this way). What you mean by "message" is probably what you get by PyObject_Str on the value object pointer (if non-0). ------------------------------------------------------------- I'm getting an error stating that "None" object has no attribute "groups" during setup of numpy, any ideas? http://www.faqts.com/knowledge-base/view.phtml/aid/6245 ------------------------------------------------------------- Michael Risser, Nicholas Hendley Oleg Broytmann It seems you are trying to do the following - match or search for regular expression: match_object = re.search(pattern, string) groups = match_object.groups() But your regexp didn't match anything in the string, so match_object here is really None. Test it before doing anything with it: match_object = re.search(pattern, string) if match_object: groups = match_object.groups() else: print "No match!" ------------------------------------------------------------- How do you access the printer from Python under Linux??? http://www.faqts.com/knowledge-base/view.phtml/aid/6376 ------------------------------------------------------------- Dave Berry, Donovan Baarda This question is very open. There are three main levels at which you can access the printer under linux; user, device, and IO port. The usual user level access is to print documents using the 'lpr' command. This will spool documents for printing in /var/spool/lpr to be printed in order when the printer is available, and allows multiple users to print documents without causing conflicts. This requires that the Linux box has lpd configured and running. Typicaly lpd is configured to use something like magic-filter to automaticly convert different types of documents into the format understood by the printer. This means most standard file types (postscript, png, text, etc) can be printed directly. (Note that there are alternatives to lpd, such as cups, that perform basicly the same thing). From Python, things can be printed as follows; import os filename='~/file.ps' os.system('lpr %s' % filename) or p=os.popen('lpr','w') p.write('printing test text string\n') p.close() Device level access involves directly opening the linux device file and writing to it. This requires that the user has write level access to the device, and does not allow shared access to the printer. This is not normaly what you want to do unless you are writing something like your own lpd replacement. Guru's might be able to do some ioctl magic on the device to do things like get the printer status, but otherwise this is pretty simple; p=os.open('/dev/lp1','w') p.write('printing text test string\n') p.close() IO port level access is the lowest level. You do not want to do this unless you really want to do wierd things with your printer port. An example of this might be plugging in some strange home-built hardware. There are a few ways to do this, but the easiest is using the linux '/dev/port' device that allows direct access to IO ports. The user must have write access to this device. WARNING!!! making a mistake when accessing '/dev/port' can seriously stuff up your system! You must know exactly what you are doing when you use this device. I probably shouldn't be writing this, because if you know enough to try this, you probably already know how :-) IOports=open("/dev/port","r+b",0) def GetChar(address): IOports.seek(address) return ord(IOports.read(1)) def PutChar(address,c): IOports.seek(address) IOports.write(chr(c)) class lpt: def __init__(self,port=0x378): self.address=port def Put_Data(self,c): PutChar(self.address,c) def Get_Data(self): return GetChar(self.address) def Put_Status(self,c): PutChar(self.address+1,c) def Get_Status(self): return GetChar(self.address+1) def Put_Control(self,c): PutChar(self.address+2,c) def Get_Control(self): return GetChar(self.address+2) p=lpt() p.Put_Data('a') c=p.Get_Status() IOPorts.close() ------------------------------------------------------------- How do you keep track of elements of "ravel"ed Numeric arrays http://www.faqts.com/knowledge-base/view.phtml/aid/4286 ------------------------------------------------------------- Nathan Wallace, Fiona Czuczman, Rob Hooft Hans Nowak, Snippet 93, Alex """ Packages: maths.numeric """ """ Hi, again. In case anyone else needs to do something like sorting an array and keeping track of what belongs where in the array, I've found the following function useful. It's not super-fast, but I guess it's doing a lot. """ import operator from Numeric import * def flatten_indices (array): index_array = indices (array.shape) index_list = map (ravel, tuple (index_array)) index_list = apply (map, (None, ) + tuple (index_list)) values = map (operator.getitem, \ len (index_list) * [array], \ index_list) return map (None, values, index_list) """ E.g. >>> b = reshape (arange (4), (2, 2)) >>> flatten_indices (b) [(0, (0, 0)), (1, (0, 1)), (2, (1, 0)), (3, (1, 1))] >>> """

1 0

Windows zip of Numerical Python 17.1.1 available
by Paul F. Dubois 31 Oct '00

31 Oct '00

Numerical 17.1.1 is available in both source and prebuilt Windows versions at: http://sourceforge.net/projects/numpy Windows users, simply extract into your top level Python 2.0 directory, typically c:\python20. Thank you to Pete Shinners for putting the Windows file together. It is too late to change for the 17 series but in future I will make releases that have whole numbers only as names and add files to that release as they become available. That makes it a little clearer that you should take the most recent file of the desired type.

1 0

Python 9 Paper Submissions
by Paul F. Dubois 31 Oct '00

31 Oct '00

The deadline for submitting a paper to the Python 9 conference is next Monday, November 6. Knowing the work habits of the Python community, I made the deadline a Monday instead of Friday. Instead of partying all weekend as usual, why not write up your work and submit it at: http://python9.org Note that the guidelines on formatting only apply to the final paper; we'll take it in any readable electronic form for now. If you want to do a poster, submit your abstract as a normal paper and just say in it that you only want it considered as a poster.

1 0

New release of VTK-CFD and vtkPipeline browser.
by Prabhu Ramachandran 29 Oct '00

29 Oct '00

hi, This is to announce new releases of VTK-CFD (version 0.5) and the python VTK pipeline browser (version 0.9). Notable enhancements are PLOT3D structured grid support, postscript save option, a new stream line/ribbon/tube module and a VTK object "pickler". VTK-CFD is written in Python, and uses Tkinter and VTK to visualize scientific data. It is distributed under the GPL. The VTK pipeline browser is included in the VTK-CFD distribution but is also available as a standalone package. The pipeline browser is distributed under the LGPL. Please visit the following for details: http://freshmeat.net/projects/vtk-cfd/ http://freshmeat.net/projects/vtkpipeline/ prabhu

1 0

ANN: AmigaPython 2.0
by Irmen de Jong 29 Oct '00

29 Oct '00

I'm happy to announce: AmigaPython 2.0 - build 1 The Amiga version of Python. WHAT IT IS: This is the Python language (version 2.0) for AmigaDOS. WHAT'S NEW ? - New version 2.0! Based on main Python 2.0 final source code. - First fully Unicode aware application on AmigaDOS! (as far as I know) - Includes fast XML parser (Expat) WHERE CAN I GET IT ? >From Aminet <http://us.aminet.net/~aminet/>, in the dev/lang directory: Python20.lha Python language 2.0 (bin+lib) Python20_Src.lha Python language 2.0 (source) Also have a look at my Python pages at <http://www.bigfoot.com/~irmen/python.html>. It comes with a Python-style license, but is otherwise free for commercial and non-commercial use. REFERENCE: <P><A HREF="http://www.bigfoot.com/~irmen/python.html"> AmigaPython 2.0</A> - AmigaDOS port of Python 2.0 (29-Oct-2000) ---- Irmen de Jong irmen@ bigfoot.com

1 0

[FAQTS] Python Knowledge Base Update -- October 29th, 2000
by Fiona Czuczman 29 Oct '00

29 Oct '00

Hi Guys, What's happened in the python knowledge base since last post(9/10). regards, Fiona Czuczman ## Unanswered Questions ######################################## ------------------------------------------------------------- How do I get the UID from os.stat mapped to a real username in NT? http://www.faqts.com/knowledge-base/view.phtml/aid/6374 ------------------------------------------------------------- Lance ------------------------------------------------------------- I'm getting an error stating that "None" object has no attribute "groups" during setup of numpy, any ideas? http://www.faqts.com/knowledge-base/view.phtml/aid/6245 ------------------------------------------------------------- Michael Risser ------------------------------------------------------------- how can i create a pop up window with entry on it, so that i can get the value from the entry and process it with the original frame, thanks http://www.faqts.com/knowledge-base/view.phtml/aid/6347 ------------------------------------------------------------- tony zhang ------------------------------------------------------------- How do you access the printer from Python under Linux??? http://www.faqts.com/knowledge-base/view.phtml/aid/6376 ------------------------------------------------------------- Dave Berry ------------------------------------------------------------- How do I check and retrieve the error conditions & message of script executed via the Python/C API (without using PyErr_Print) http://www.faqts.com/knowledge-base/view.phtml/aid/6234 ------------------------------------------------------------- Kostas Karanikolas ## New Entries ################################################# ------------------------------------------------------------- How can I get my _full_ program name (eg. "mylongpythonscript.py") under eg. NT? sys.argv[0] gives me the truncated MS-DOS style, "MYLONG~1.PY" etc. http://www.faqts.com/knowledge-base/view.phtml/aid/6159 ------------------------------------------------------------- Jon Nicoll, Fiona Czuczman Alex Martelli This seems to work in my setup (2.0b2, Win98): import sys try: raise RuntimeError except: x=sys.exc_info()[2] print x.tb_frame.f_code.co_filename Placing this in alongfilename.py and running python alongfilename.py results in the expected output: alongfilename.py ################################################## # Under (NT4, Python v1.5.2), the above also gives # the 'short' form for me. # This is a bit more Win32 specific, but works for my environment import sys import win32api print win32api.FindFiles(sys.argv[0])[0][8] ## Edited Entries ############################################## ------------------------------------------------------------- Where can I best learn how to parse out both HTML and Javascript tags to extract text from a page? http://www.faqts.com/knowledge-base/view.phtml/aid/3680 ------------------------------------------------------------- Paul Allopenna, Matthew Schinckel, Magnus Lyckå Python Documentation If you want to (quickly) strip all HTML tags from a string of data, try using the re module: import re file = open(filename,'r') data = file.read() file.close() text = re.sub('<.*?>', '', data) #Remove comments first, or '>' in #comments will be interpreted as #end of (comment) tag. text = re.sub('', '', text) This will also strip any javascript, but only if the page has been made 'properly' - that is, the javascript is within HTML comments. If you want to know how it works, read the 're' chapter in the library reference, as it discusses the usefulness of 'non-greedy' regular expressions. ------------------------------------------------------------- How do I change the name of a process (as viewed by 'ps') from Python? http://www.faqts.com/knowledge-base/view.phtml/aid/6149 ------------------------------------------------------------- Adam Feuer, Fiona Czuczman Oleg Broytmann Don't know much about Mac. Probably, there is no such thing as "process name". :) On Windows, it is possible, and I saw a code doing that. Probably, Mark Hammond was the author, if I remember it right. On UNIX it is impossible now. To do this, someone will need to wrap one of "setproctitle" sources. The most known code is "setproctitle" from sendmail, but it accompanied with not-so-free license. More liberal license is for similar code in PostgreSQL, so if anyone is interested to do some work and produce a working module - PostgreSQL is a good place to start.

1 0

PythonLabs Team Moves to Digital Creations
by Guido van Rossum 28 Oct '00

28 Oct '00

To all Python users and developers: Less than half a year ago, I moved with my team to BeOpen.com, in the hope of finding a new permanent home for Python development. At BeOpen, we've done several good things for Python, such as moving the Python and Jython development process to SourceForge, and the successful release of Python 2.0. Unfortunately, BeOpen.com's original plans for PythonLabs didn't work out as hoped, and we weren't able to reach mutual agreement on workable alternative plans -- despite trying for months. I am proud to have found a new home for my entire team: starting today, Tim Peters, Barry Warsaw, Jeremy Hylton, Fred Drake and myself are working for Digital Creations. We will be spending part of our time on core Python development (including Jython and Mailman) and part of our time on Python infrastructure improvements that also benefit Zope. Python will remain Open Source; Digital Creations has no desire to monetize or brand the Python language or specific Python distributions. All future work we do on Python as Digital Creations employees will be owned by a non-profit organization yet to be created. We think of this new organization as the Python Software Foundation. In the meantime (while the PSF is under construction) I will own such copyrights personally. We're excited to be working for Digital Creations: they are one of the oldest companies active in the Python community, one of the companies most committed to Python, and they have a great product! Plus, we know they have deep financial backing. We trust that Digital Creations will provide a stable home for Python for many years. Digital Creations has also offered to take over hosting of the python.org and starship sites. On behalf of the Python community, we're grateful for this support of the two prime community sites for Python, and we expect to be implementing the transitions shortly. These are exciting times for the PythonLabs team -- and also for Python and its community. Mainstream successes for Python are showing up everywhere, and we're proud to be a part of such a smart and friendly community. A great year lies ahead! --Guido van Rossum (home page: http://www.python.org/~guido/)

1 0

ANNOUNCE: wxPython 2.2.2
by Robin Dunn 27 Oct '00

27 Oct '00

wxPython 2.2.2 has finally been released! You can get your copy at http://wxPython.org/download.php. At that site you'll find the sources, docs, and binaries for Linux and Win32 for both Python 1.5.2 and Python 2.0 Here's an excerpt from the CHANGES.txt file: New in 2.2.2 ------------ Significantly changed how the wxStyledtextCtrl code that wraps Scintilla is implemented. Most of it is now automatically generated from an interface definition file provided by Scintilla. This means that it will be much easier to stay in sync with new Scintilla releases, but also means that some of the method and identifier names have changed. See wxPython/demo/data/stc.h for a copy of the C++ interface from which the Python interface is generated. There is now some inline documentation in that file that should really help explain how things work. I am now using the Python Distutils to build wxPython and to make some of the distribution files. (See http://www.python.org/sigs/distutils-sig/) This means no more messing with my kludgy build.py/Makefile hack, builds will be more consistent with other Python extensions that also use Distutils, and will hopefully make wxPython easier to build for platforms where there have been troubles before. If you are building wxPython for Python 1.5.2 or for 1.6, then you will need to get and install version 1.0 of Distutils from the website above. If you are using Python 2.0 then you already have it. Added wxInputStream and the wxFileSystem family of classes, contributed by Joerg Baumann. Added wxProcess and support for it to wxExecute. wxProcess lets you get notified when an asyncronous child process terminates, and also to get input/output streams for the child process's stdout, stderr and stdin. Removed the old python sizers. Added __add__, __sub__ and __cmp__ (equality check only) for wxPoint and wxRealPoint. Changed the build to make one big extension module instead of one for the core and each contrib. This allowed me to do away with the libwxPyHelpers.so on unix systems. Lots of little fixes here and there. Some hacks on wxGTK to try and make the AutoComplete listbox in the wxStyledTextCtrl to behave better. It's still not as nice as on wxMSW, but at least it's a bit more usable now. -- Robin Dunn Software Craftsman robin(a)AllDunn.com http://wxPython.org Java give you jitters? http://wxPROs.com Relax with wxPython!

1 0

[ANN] Creating Py Extensions Using Borland's Free Compiler v3.0
by Gordon Williams 24 Oct '00

24 Oct '00

*** Creating Python Extensions Using Borland's Free Compiler V2.0*** I am pleased to announce a set of step-by-step instructions and examples to create extensions using the free Borland Command Line Compiler with the standard Python Windows Binary Distribution. This information can be found at http://www.cyberus.ca/~g_will/pyExtenDL.shtml . Version 3.0 updates the linking library to Python 2.0 and removes an obsolete patch for the Python 1.5.2 config.h file. I have also added a section about using VIDE (http://www.objectcentral.com/), a free and useful IDE for Borland and other compilers. ********************************************************************** ABSTRACT This paper describes the method used to create Python Extensions using the Borland 5.5 C++ Compiler (BCC). This command line compiler is available free from http://www.borland.com/bcppbuilder/freecompiler/. I describe the steps that are necessary to produce the extension from the C source code and how to set up the associated files for the compiler and linker. These extensions work with the standard Windows Distribution of Python. The process used to produce the extension is very easy and consists of running a simple batch file that I provide as part of this package. A section is provided on how to create extensions using VIDE to make it even easier. I also have some examples and a short reference section at the end of this paper that may be helpful. Gordon Williams g_will(a)cyberus.ca

1 0