[Tutor] python: can't open file 'ex1.py' : [Errno 2] No such file or directory

[Carter Danforth]

Thanks a lot Alan and Karim, it's working -- I really appreciate it, guys.


On Wed, Aug 25, 2010 at 4:53 AM, <tutor-request at python.org> wrote:

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> Today's Topics:
>
>   1. Re: continuous running of a method (Greg Bair)
>   2. Re: continuous running of a method (Hugo Arts)
>   3. Re: Retriving previous user inputs in a gui (Alan Gauld)
>   4. Re: python: can't open file 'ex1.py' : [Errno 2] No such
>      fileor directory (Alan Gauld)
>   5. os.access unreliable? (Albert-Jan Roskam)
>   6. Re: os.access unreliable? (Tim Golden)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 25 Aug 2010 01:56:14 -0400
> From: Greg Bair <gregbair at gmail.com>
> To: tutor at python.org
> Subject: Re: [Tutor] continuous running of a method
> Message-ID: <4C74B07E.3060803 at gmail.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 08/25/2010 01:25 AM, Nitin Das wrote:
> > The problem with this while loop is if your random value doesn't lie
> > between the mentioned range then ur 100% cpu would be utilized. The
> > one thing u can do is to sleep for some time lets say 0.5 sec after
> > every while loop iteration , in this case ur cpu utilization will go
> down.
> It's not that the value doesn't lie between the mentioned range.
>
> What I'm doing is randomly fetching an item from a list of dicts
> (multi-dimensional ones from a JSON response) and accessing a value from
> it, but not every item has the key I'm looking for (can't change that).
> I suppose what I could do to not randomize every time is to iterate
> through the list and create a new list that only contains dicts that
> have that key, then get a random one from that.  I suppose that would be
> more efficient.
>
> Any thoughts?
>
> Greg
> >
> > --nitin
> >
> > On Mon, Aug 23, 2010 at 8:21 PM, bob gailer <bgailer at gmail.com
> > <mailto:bgailer at gmail.com>> wrote:
> >
> >      On 8/23/2010 1:00 AM, Greg Bair wrote:
> >
> >         I have a method (I'll call it foo) that will either return
> >         None or an object depending on a random value generated.  What
> >         I want to happen is that if I call foo(), i.e, f = foo() and
> >         it returns None, to re-call it until it returns something
> >         else.  I would think this would be done with a while loop, but
> >         can't seem to get the details right.
> >
> >
> >     Even though a while will work, you will have tied up the CPU until
> >     the loop terminates. This is never a good idea.
> >
> >     What is your higher level goal?
> >
> >
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 25 Aug 2010 02:12:46 -0500
> From: Hugo Arts <hugo.yoshi at gmail.com>
> To: Greg Bair <gregbair at gmail.com>
> Cc: tutor at python.org
> Subject: Re: [Tutor] continuous running of a method
> Message-ID:
>        <AANLkTingRibT-sBecPi7BtUZQ5VfUz3e4mNTkM2Sa_KS at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On Wed, Aug 25, 2010 at 12:56 AM, Greg Bair <gregbair at gmail.com> wrote:
> >
> > It's not that the value doesn't lie between the mentioned range.
> >
> > What I'm doing is randomly fetching an item from a list of dicts
> > (multi-dimensional ones from a JSON response) and accessing a value from
> it,
> > but not every item has the key I'm looking for (can't change that). ?I
> > suppose what I could do to not randomize every time is to iterate through
> > the list and create a new list that only contains dicts that have that
> key,
> > then get a random one from that. ?I suppose that would be more efficient.
> >
> > Any thoughts?
> >
>
> this sounds like a good idea. Either the filter() function or a list
> comprehension can filter out the dicts you want easily.
>
> My guess is the list comprehension is somewhat faster, but I could be
> wrong. And it doesn't sound like performance is a very big deal here
> anyway, so take your pick.
>
> Hugo
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 25 Aug 2010 08:21:31 +0100
> From: "Alan Gauld" <alan.gauld at btinternet.com>
> To: tutor at python.org
> Subject: Re: [Tutor] Retriving previous user inputs in a gui
> Message-ID: <i52g9o$cqi$1 at dough.gmane.org>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=original
>
>
> "Karim" <karim.liateni at free.fr> wrote
>
> > Is there any equivalent to JAVACC in python (or lex yacc) to create
> > grammary
> > for config or format file?
>
> Thats kind of what ConfiogParser does - it gives you tools to
> read/write
> a config file.
>
> If you don't mind the data not being human readable you could also
> use the shelve module which simulates a dictionary in a file.
>
> There are lots of options.
>
> Alan G.
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 25 Aug 2010 08:30:59 +0100
> From: "Alan Gauld" <alan.gauld at btinternet.com>
> To: tutor at python.org
> Subject: Re: [Tutor] python: can't open file 'ex1.py' : [Errno 2] No
>        such    fileor directory
> Message-ID: <i52grh$es3$1 at dough.gmane.org>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=original
>
>
> "Carter Danforth" <carter.danforth at gmail.com> wrote
>
> > Anyhow, I can't seem to be executing any files in terminal for some
> > reason, in this case the file ex1.py:
> >
> > C:\Users\Carter Danforth\python ex1.py
> > python: can't open file 'ex1.py': [Errno 2] No such file or
> > directory
> >
> > ex1.py is located in "pythonpractice" on my desktop and I've updated
> > the
> > modules, here's the output from sys.path:
>
> sys.path (and PYTHONPATH) only affect how imports work within
> Python, they have no effect on Windows ability to find scripts.
> To run a script you must do one of the following:
>
> 1) CD to the script folder and run Python from there as:
>      > Python myscript.py
>
> 2) From anywhere execute Python as
>    > python full\path\to\myscript.py
>
> 3) From anywhere execute myscript as
>   > myscript.py
>
> For 1,2 PATH must include the Python executable folder
> For 3 the .py extension must be associated with the Python
> executable and the folder containing myscript must be in PATH.
>
> > I'm not sure why I keep getting this error message and why I'm not
> > able to
> > execute any .py files. Any help would be great appreciated.
>
> Windows needs to know where the file lives. You could have many
> files called myscript.py in your file system. PYTHONPATH is used
> only by Python and only for imports. PATH is used only for
> executables.
>
> HTH,
>
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 25 Aug 2010 01:28:47 -0700 (PDT)
> From: Albert-Jan Roskam <fomcl at yahoo.com>
> To: Python Mailing List <tutor at python.org>
> Subject: [Tutor] os.access unreliable?
> Message-ID: <502129.63760.qm at web110716.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> Hi I'm using os.access to do a preliminary check to see if I have RW
> access, but
> it seems to be unreliable. In a dir for which I have only read access,
> os.access
> also says I have write access. This is under Windows 2000. I could of
> course use
> a try-except and catch the IOError, but I'd like to know why the code below
> isn;t working.
>
> ??? def isAcccessible(self):
> ??????? if os.access(self.path, os.R_OK) and os.access(self.path, os.W_OK):
> ??????????? return True
> ??????? else:
> ??????????? return False
> ?Cheers!!
> Albert-Jan
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> All right, but apart from the sanitation, the medicine, education, wine,
> public
> order, irrigation, roads, a fresh water system, and public health, what
> have the
> Romans ever done for us?
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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> ------------------------------
>
> Message: 6
> Date: Wed, 25 Aug 2010 09:53:08 +0100
> From: Tim Golden <mail at timgolden.me.uk>
> Cc: Python Mailing List <tutor at python.org>
> Subject: Re: [Tutor] os.access unreliable?
> Message-ID: <4C74D9F4.3030607 at timgolden.me.uk>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 25/08/2010 09:28, Albert-Jan Roskam wrote:
> > Hi,
> >
> > Hi I'm using os.access to do a preliminary check to see if I have RW
> access, but
> > it seems to be unreliable. In a dir for which I have only read access,
> os.access
> > also says I have write access. This is under Windows 2000. I could of
> course use
> > a try-except and catch the IOError, but I'd like to know why the code
> below
> > isn;t working.
> >
> >      def isAcccessible(self):
> >          if os.access(self.path, os.R_OK) and os.access(self.path,
> os.W_OK):
> >              return True
> >          else:
> >              return False
>
> os.access is effectively meaningless under Windows, especially
> against directories. It only checks the read-only flag (which
> doesn't mean anything for directories anyway).
>
> There is a long-open issue here:
>
>   http://bugs.python.org/issue2528
>
> which I am half-minded to close although I could be
> persuaded to pursue it if anyone were interested enough.
> On the other hand, os.access checks are open to race-conditions
> in any case, so you might simply be better off with a
> try-except block as you suggest.
>
> If you want more information I can explain further but unless you
> want to dive into the Windows API and use AccessCheck -- which is
> what that patch is doing -- then I suggest you use try-except
>
> TJG
>
>
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>
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