Re: Ann: Tkinter drag and drop module

[[EMAIL PROTECTED]]

yup. that's exactly what i did, on win2k...

somehow, i was surprised that it would work - the filepath + file name
from the binary i'd dragged and dropped onto the .exe file was properly
passed to the frozen python script as an arg...

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Re: How to limit the uploading file size in python?

[Fuzzyman]

Hello Prabahar,

It entirely depends on the mechanism you are using to receive the file
(there is no generic solution).

Is it within a CGI ? The normal way would be to check the file sized
and discard if it's too big. You'll have to do it within your code -
but it's probably a one line check !

Best Regards,

Fuzzy
http://www.voidspace.org.uk/python

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Re: Generating images with text in them

[Terry Hancock]

On Wednesday 20 July 2005 11:59 pm, phil hunt wrote:
> I am trying to generate some images (gifs or pngs) with text in 
> them. I can use the Python Imaging Library, but it only has access 
> to the default, rather crappy, font.

On the fly, or just during development?

In any case, you should be aware of the Skencil vector graphic
program which is written in Python (with some C extensions),
and which is also, of course, a python vector-graphics library.

Unfortunately, getting it to work in a server environment might
not be too pretty (requires GTK, etc, even if you don't actually
use it).  I tried to make a stripped down version that didn't
require the desktop stuff, but it hasn't worked out so well yet.

> Alternately, is there a good source of PIL font files (.pil files)
> somewhere?

I believe there is a utility for converting other types of fonts, you
might have to go through a couple of different conversions from
the font files you have.

> If the writers of the Python Imaging Library are reading this, may I 
> suggest that they add more fonts to it. Yes, that would increase 
> the size, but these days disk space is cheap and programmer time
> expensive.

While bitmap font files are not copyrightable, there are license issues
with most of the "nicer" fonts you are probably talking about. That
complicates bundling them with the software. The PIL site does
actually have some additional fonts for download, though, IIRC.

--
Terry Hancock ( hancock at anansispaceworks.com )
Anansi Spaceworks  http://www.anansispaceworks.com

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RE: Lots of pdf files

[Tim Golden]

[Greg Lindstrom]

| There does not appear to be a simple way to merge many pdf's 
| into one.

I'm currently using ghostscript (on Win32) to merge multiple 
postscript files into one PDF (by specifying multiple inputs
to the gswin32c command). I imagine it can do the same for
multiple PDF inputs on Linux.

TJG


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Web-Forms

[Mathias Waack]

Hi, 

I need to access some information from a web site which are only accessible
through a form. Thus for each bucket of data you have to fill out the form,
submit it and wait for an answer. Very easy - if you don't have to check
some hundred times. Of course this site requires cookies, it is not
directly accessible by URL and so on. All that nice stuff used to make a
web site more professional;)

But now the question: how can this be solved by using Python?

Mathias
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Re: I just wanna know about os.path module..

[Peter Otten]

kimes wrote:

> You said 'At first os - module, or package, it doesn't matter here - is
> imported.'

With a file mop.py in your path

import mop

creates a module instance and executes mop.py to fill it with content --
classes, functions, whatever python objects you can think of -- and puts
that module instance into the sys.modules cache. With a file
mop/__init__.py, the process is the same except that the code to fill the
module is taken from the __init__.py file. Differences only appear when you
try to import submodules.

> I'm still confused about that..
> When I just call import os.path without calling import os..
> In that case, you mean 'import os' is called implicitly?

Yes. Try it yourself with a package/submodule where __init__.py and
submodule.py just contain a print statement. I find such an experimental
approach often more convenient than haunting the docs.

> Why? and How?

Because it's a sensible assumption that a submodule depends on its parent
package? Because it makes access of submodules as easy as attribute access
for any other object? Because it makes conditional imports easy (see
Terry's post)? Because it's the simplest approach that just works?

> how python knows it should call import when we call import os?
> Please make me clear.. :)

Conceptually, when you have a module alpha.beta.gamma you need just a bit of
string processing. "alpha.beta.gamma".split() -- aah, I have to import
alpha, then alpha.beta, then alpha.beta.gamma... read the source for the
strategy that is actually taken if you really care.

Peter

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Re: How to use octave in python

[travlr]

And or numarray :)

http://www.stsci.edu/resources/software_hardware/numarray

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Couple quick questions from a Python Noob

[digitalsubjunctive]

Hey, I just started on Python and have a few questions I couldn't find
answers to on the Python site or it's tutorial.

1. I notice a few "compiled python" files (indicated by reddish snake
icons), I thought Python didn't need to be compiled? This is my first
venture into programming, but if it doesn't need to be compiled why
compile it?

2. What is a .pwy file?

3. I want to save my first few programs as .exe files so I can show
them off to all my leet friends. Okay, so the only program I've made
takes your birthday and tells you what you're astrological sign is, but
I'm in rural Nebraska and we don't have all that much to do :)

Thanks for any help you guys!

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spurious syntax error when updating to 2.4 ?

[Simon Dahlbacka]

Hi,

I'm doing some preparation for a hopefully upcoming transition to
python 2.4 (from 2.3.4) on winxp platform

However, I'm getting SyntaxErrors in files that worked fine in 2.3, it
tells me that e.g.

newLanguage.language =
languageElement[0].firstChild.data.encode("ascii")

this line is broken

However, if I modify my file just for the heck of it and comment that
particular line, I still might get syntax error on that particular
line, or if I insert a line before that particular line I might get
away with it?

Has anyone seen anything similar, or even better knows what causes
this?

/Simon

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Re: Copying attributes

[red]

Terry Hancock wrote:
> I'm not sure either, yet, but can you indicate which line in your
> listing is 102 in the source file?  That might be helpful.

101: ## f1.normal = copy.deepcopy(f.normal)
102:f1.normal = NMesh.Vert(f.normal[0], f.normal[1], f.normal[2])

I've tried with deepcopy, but the result is exactly same.

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RE: returning list of strings from Python COM to Visual basic 6

[Stefan Schukat]

You have to wrap the python object with a COM object: 

def Get_Obj(self):
return win32com.server.util.wrap(an_object)


Stefan

> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> Philippe C. Martin
> Sent: Thursday, July 21, 2005 1:42 AM
> To: python-list@python.org
> Subject: Re: returning list of strings from Python COM to 
> Visual basic 6
> 
> 
> I can now pass and return quite a few types except object 
> instances: my
> python code gets to the point where I do:
> 
> 
> def Get_Obj(self):
> .
> return an_object
> 
> My VB code looks like
> 
> Dim obj as Variant
> 
> obj = acom.Get_Obj()
> 
> 
> I get an "unexpected Python error . Objects of type 
> 'instance' can not
> be converted to a COM VARIANT"
> 
> Is there a way out ?
> 
> Thanks,
> 
> Philippe
> 
> 
> 
> 
> 
> 
> Philippe C. Martin wrote:
> 
> > Hi,
> > 
> > Is it possible ?
> > 
> > ex: return ['1','2']
> > 
> > If so which type should I use in VB ?
> > 
> > dim res as ???
> > 
> > Set testObj = CreateObject("")
> > 
> > res = testObj.AMethodThatReturnsAListOfStrings()
> > 
> > 
> > Thanks,
> > 
> > Philippe
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

The "Leading Manufacturing Test Company of the Year 2005"
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Re: is this pythonic?

[Thomas Lotze]

Mage wrote:

> Or is there better way?
> 
> for (i, url) in [(i,links[i]) for i in range(len(links))]:
>   ...
> 
> "links" is a list.

for i, url in enumerate(links):

-- 
Thomas

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Re: Couple quick questions from a Python Noob

[bruno modulix]

[EMAIL PROTECTED] wrote:

> Hey, I just started on Python and have a few questions I couldn't find
> answers to on the Python site or it's tutorial.
> 
> 1. I notice a few "compiled python" files (indicated by reddish snake
> icons), I thought Python didn't need to be compiled? This is my first
> venture into programming, but if it doesn't need to be compiled why
> compile it?

Just like Java, the Python interpreter runs python byte-code. The Python
compiler compile Python source code into Python byte-code. Now the
difference with Java is that you don't have to manually call the
compiler - the interpreter will do it for you if and when needed.

If you don't know what 'byte-code' is, it's just like a machine language
(op-codes and the like) for a processor that doesn't exists - in fact
this 'processor' is the interpreter (or 'Virtual Machine') itself.

The main purpose is to have something that execute faster than purely
interpreted languages (since parsing is already done), and is still
portable between platforms (which is not that much important with
Python, since we usually distribute the source files...).

> 2. What is a .pwy file?

(isn't that .pyw ?)
It's a Windows-only stuff that avoid the DOS shell window to be opened
when executing the script.

> 3. I want to save my first few programs as .exe files so I can show
> them off to all my leet friends. 

'.exe' files are Windows-specific. Python doesn't handle this out of the
box. But there are programs like py2exe (and others, don't remember
their name) that 'freeze' your script, the interpreter and all needed
librairies in a .exe.

HTH
-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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Re: File Table List in Plone

[bruno modulix]

[EMAIL PROTECTED] wrote:
> All,
> 
> Is there is a Plone type or product for generating a file list on a
> plone page, eg: a list of downloadable files in a table?  An example of
> what I want can be found at
> http://www.zope.org/Members/MacGregor/ExtFile under "Available
> Releases" where a list of files resides.
> 
> Is this a manually generated table or is there a way I can drop a Plone
> type into a page to generate such a list?
> 
I think you'll get better answers on a plone mailing-list.

-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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Re: Python IDE

[linuxfreak]

ok will give it a shot.
I had tried the 0.7.2 version with wxPython 2.6 and the moment i place
the cursor in a class name and pressed the space or the enter
key.booom there it went crashing without a trace. But i did like
what little i saw of it (apart from the crashes, of course) and the UML
diagram feature was just great. Lemme use this version and then i can
give some feedback. One more thingI'm trying to use the
wxStyledTextCtrl in one of my programsany pointers to where I can
find a good tutorialTried yellowbrain.com but it just has the docs
and not a tutorial. Thanks a ton and keep up the good work

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Re: Lots of pdf files

[Ralf Muschall]

Greg Lindstrom wrote:
> Hello-
> I'm running Python 2.3 on a Linux system and have lots (about 2000)
> files in pdf format to print each day.  If I just wind up and fire all
> the files at the printer at once (as 2000 separate print jobs), the
> print server throws a fit and our system admin comes down and slaps me
> around for a few minutes (which, I guess, is fair).

Are your sure it is the number (and not the sum of the sizes) of
the jobs your admin is worrying about?

What about

#!/bin/sh
for i in *.pdf; do
  lpr $i
  sleep 10
done

(maybe adding something that waits until the queue is empty instead
of sleep)?

Ralf
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Re: Need to interrupt to check for mouse movement

[stringy]

Cheers for the replies people, but I got it sorted by just whacking in
wx.YieldIfNeeded() in the code before it communicates over the socket.
It's kind of jerky, but it works, where as before I'd click and drag,
and the 3d view wouldn't move for about 20 seconds.

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newbie - mode for directory

[wcc]

Hello,

When using os.mkdir, what are the numeric numbers for different modes?
I could only find mode=0777 means read-only.  Thanks, - wcc

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Re: newbie - mode for directory

[Sybren Stuvel]

wcc enlightened us with:
> When using os.mkdir, what are the numeric numbers for different
> modes?

man chmod

Sybren
-- 
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capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself? 
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wxPythin installation woes

[linuxfreak]

Hi all,

Was working with python 2.3 in a fedora core 3 machine. I upgraded it
to Fedora Core 4 with a clean install. So now I have python 2.4
installed. But when I try to install wxPython for python 2.4 using an
rpm file i downloaded from the wxpython web site i get dependencies
errors. Turns out that  libstdc++.so.5 is needed but I checked and i
see that libstdc++.so.6 is installed on my system. Help needed guys and
needed pronto. Thanks a ton once again :)

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Python Path Setting

[Neil Benn]

Hello,

  I'm trying to find some detailed documentation about 
PYTHONPATH, paths.pth, lib/site-packages, sitecustomise and so on.  I 
know what they do but I'd like some detailed documentation about what 
gets loaded where and when.  However I can't find the documentation on 
this. 

Googling for 'python PYTHONPATH' give me a bunch of stuff about 
setting the pythonpath for a specific app or about pythonpath itself but 
not the whole range of options as detailed above.

However, I'd like more documentation about search paths, module 
loading and the like - does anyone know where I can find this?

Cheers,

Neil

-- 

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Senior Automation Engineer
Cenix BioScience
BioInnovations Zentrum
Tatzberg 47
D-01307
Dresden
Germany

Tel : +49 (0)351 4173 154
e-mail : [EMAIL PROTECTED]
Cenix Website : http://www.cenix-bioscience.com

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wxPythin installation woes

[linuxfreak]

Hi all,

Was working with python 2.3 in a fedora core 3 machine. I upgraded it
to Fedora Core 4 with a clean install. So now I have python 2.4
installed. But when I try to install wxPython for python 2.4 using an
rpm file i downloaded from the wxpython web site i get dependencies
errors. Turns out that  libstdc++.so.5 is needed but I checked and i
see that libstdc++.so.6 is installed on my system. Help needed guys and
needed pronto. Thanks a ton once again :)

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Re: Web-Forms

[Simon Brunning]

On 7/21/05, Mathias Waack <[EMAIL PROTECTED]> wrote: 
> I need to access some information from a web site which are only accessible
> through a form. Thus for each bucket of data you have to fill out the form,
> submit it and wait for an answer. Very easy - if you don't have to check
> some hundred times. Of course this site requires cookies, it is not
> directly accessible by URL and so on. All that nice stuff used to make a
> web site more professional;)
> 
> But now the question: how can this be solved by using Python?

Mechanize?



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[EMAIL PROTECTED],
http://www.brunningonline.net/simon/blog/
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Re: Lots of pdf files

[Duncan Booth]

Greg Lindstrom wrote:

> I'm running Python 2.3 on a Linux system and have lots (about 2000) 
> files in pdf format to print each day.  If I just wind up and fire all 
> the files at the printer at once (as 2000 separate print jobs), the 
> print server throws a fit and our system admin comes down and slaps me 
> around for a few minutes (which, I guess, is fair).
> 
> There does not appear to be a simple way to merge many pdf's into one.  
> I could, for example, merge all of the files for a particular provider 
> into one pdf for that provider and then print it (or, better 
> yet...encrypt it and ship it!), but I do not see a way.
> 

A quick Google search turns up lots of program which claim to merge PDFs 
files. e.g. http://www.verypdf.com/pdfpg/index.html (for a mere $29.90, 
except it is GPL'd so I'm not sure what the money is for).

Or perhaps PDCAT, http://www.pdf-tools.com/asp/products.asp?name=CLE for 
$150, or $250 if you want to be able to encrypt the output and ship it.
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Re: is a file open ?

[luis]

John Machin wrote:
> Daniel Dittmar wrote:
> 
>> luis wrote:
>>
>>> for root, dirs, files in os.walk(path):
>>>for file in files:
>>>   # ¿ is opened ?
>>
>>
>>
>> On Linux and some other Unixes, you can probably read the /proc 
>> filesystem.
>>
>> On Windows, you'll probably get the quickest result by running 
>> handle.exe (http://www.sysinternals.com/Utilities/Handle.html).
>>
>> Either way, the information you'll get is restricted by your permissions.
>>
>> Either information will get stale really fast, so it's not suitable if 
>> your task is something like 'can I backup this directory or is someone 
>> writing to a file?'
> 
> 
> If that's what the OP had in mind, the question might have been better 
> phrased as "given the path to a file, how can I tell if it is currently 
> opened by another process/thread", and better directed to OS-specifc 
> newsgroup(s).
> 
there is a specific python function ?
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Re: is a file open ?

[luis]

John Machin wrote:
> Daniel Dittmar wrote:
> 
>> luis wrote:
>>
>>> for root, dirs, files in os.walk(path):
>>>for file in files:
>>>   # ¿ is opened ?
>>
>>
>>
>> On Linux and some other Unixes, you can probably read the /proc 
>> filesystem.
>>
>> On Windows, you'll probably get the quickest result by running 
>> handle.exe (http://www.sysinternals.com/Utilities/Handle.html).
>>
>> Either way, the information you'll get is restricted by your permissions.
>>
>> Either information will get stale really fast, so it's not suitable if 
>> your task is something like 'can I backup this directory or is someone 
>> writing to a file?'
> 
> 
> If that's what the OP had in mind, the question might have been better 
> phrased as "given the path to a file, how can I tell if it is currently 
> opened by another process/thread", and better directed to OS-specifc 
> newsgroup(s).
> 
there is a specific python function ?
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Re: Couple quick questions from a Python Noob

[stringy]

For compiling Python, http://effbot.org/zone/python-compile.htm appears
to have some information, although I've never done it myself, so I
wouldn't know any more on the matter.

Also http://starship.python.net/crew/theller/py2exe/ appears to have
something on Python-> .exe

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Re: Generating images with text in them

[Daren Russell]

phil hunt wrote:
> I am trying to generate some images (gifs or pngs) with text in 
> them. I can use the Python Imaging Library, but it only has access 
> to the default, rather crappy, font. 
> 
> Ideally I'd like to use one of the nicer fonts that come with my X 
> Windows installation. Using Tkinter I can draw these fonts on the 
> screen; is there any way to get these fonts into a bitmapped image?
> For example, can I draw some text on a canvas and then "grab" that 
> canvas as a bitmap into PIL, and then save it as a file?
> 
> Alternately, is there a good source of PIL font files (.pil files)
> somewhere?
> 
> If the writers of the Python Imaging Library are reading this, may I 
> suggest that they add more fonts to it. Yes, that would increase 
> the size, but these days disk space is cheap and programmer time
> expensive.
> 

I've just been playing around with this.  You can use truetype fonts with:

font = ImageFont.truetype("/path/to/font.ttf", 12)

from version 1.1.4

http://www.pythonware.com/library/pil/handbook/imagefont.htm for more
details

HTH
Daren

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Re: Generating images with text in them

[John Abel]

Have you downloaded the pilfonts.zip from effbot.org?

J

phil hunt wrote:

>I am trying to generate some images (gifs or pngs) with text in 
>them. I can use the Python Imaging Library, but it only has access 
>to the default, rather crappy, font. 
>
>Ideally I'd like to use one of the nicer fonts that come with my X 
>Windows installation. Using Tkinter I can draw these fonts on the 
>screen; is there any way to get these fonts into a bitmapped image?
>For example, can I draw some text on a canvas and then "grab" that 
>canvas as a bitmap into PIL, and then save it as a file?
>
>Alternately, is there a good source of PIL font files (.pil files)
>somewhere?
>
>If the writers of the Python Imaging Library are reading this, may I 
>suggest that they add more fonts to it. Yes, that would increase 
>the size, but these days disk space is cheap and programmer time
>expensive.
>
>  
>

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Re: returning list of strings from Python COM to Visual basic 6

[Philippe C. Martin]

Thanks a bunch,

I'll try this, This raises two questions:
1) How do I declare the receiving VB variable ?
2) Then, can I use the returned object as a COM object: call its public 
methods (that would be hot)?


Dim newobj as ?
newobj = acom.Get_Obj()

newobj.A_Public()


Regards,

Philippe





On Thursday 21 July 2005 09:55 am, Stefan Schukat wrote:
> You have to wrap the python object with a COM object:
>
> def Get_Obj(self):
>   return win32com.server.util.wrap(an_object)
>
>
>   Stefan
>
> > -Original Message-
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] Behalf Of
> > Philippe C. Martin
> > Sent: Thursday, July 21, 2005 1:42 AM
> > To: python-list@python.org
> > Subject: Re: returning list of strings from Python COM to
> > Visual basic 6
> >
> >
> > I can now pass and return quite a few types except object
> > instances: my
> > python code gets to the point where I do:
> >
> >
> > def Get_Obj(self):
> > .
> > return an_object
> >
> > My VB code looks like
> >
> > Dim obj as Variant
> >
> > obj = acom.Get_Obj()
> >
> >
> > I get an "unexpected Python error . Objects of type
> > 'instance' can not
> > be converted to a COM VARIANT"
> >
> > Is there a way out ?
> >
> > Thanks,
> >
> > Philippe
> >
> > Philippe C. Martin wrote:
> > > Hi,
> > >
> > > Is it possible ?
> > >
> > > ex: return ['1','2']
> > >
> > > If so which type should I use in VB ?
> > >
> > > dim res as ???
> > >
> > > Set testObj = CreateObject("")
> > >
> > > res = testObj.AMethodThatReturnsAListOfStrings()
> > >
> > >
> > > Thanks,
> > >
> > > Philippe
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
>
> The "Leading Manufacturing Test Company of the Year 2005"
> http://www.dspace.de/goto?f_s_award

-- 
*
Philippe C. Martin
SnakeCard, LLC
www.snakecard.com
+1 405 694 8098
*
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UPDATE: SPE 0.7.4.d Python Editor released

[Stani]

Something which prevented SPE 0.7.4.a to start is fixed

Stani

PS http://www.stani.be/python/spe/blog

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Re: gdb python C API

[fraca7]

derrick a écrit :

> are there any tools / methods that others have used to get what line of
> the python script is being executed while running in gdb? or if it would
> actually show me the source python script (instead of the the python c
> source) that would help.

I don't think so, but when having a memory problem I usually find 
valgrind very useful.

http://valgrind.org/

HTH
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A sad story about a real "Python"

[Marco Aschwanden]

http://www.snopes.com/photos/animals/fencesnake.asp

Cheers,
Marco


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Re: wxPythin installation woes

[Sybren Stuvel]

linuxfreak enlightened us with:
> Turns out that  libstdc++.so.5 is needed but I checked and i see
> that libstdc++.so.6 is installed on my system.

On my system (Ubuntu, based on Debian), I can have multiple versions
of libstdc++ installed at the same time.

Sybren
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capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself? 
 Frank Zappa
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Re: is a file open ?

[John Machin]

luis wrote:
> John Machin wrote:
> 
>> Daniel Dittmar wrote:
>>
>>> luis wrote:
>>>
 for root, dirs, files in os.walk(path):
for file in files:
   # ¿ is opened ?
>>>
>>>
>>>
>>>
>>> On Linux and some other Unixes, you can probably read the /proc 
>>> filesystem.
>>>
>>> On Windows, you'll probably get the quickest result by running 
>>> handle.exe (http://www.sysinternals.com/Utilities/Handle.html).
>>>
>>> Either way, the information you'll get is restricted by your 
>>> permissions.
>>>
>>> Either information will get stale really fast, so it's not suitable 
>>> if your task is something like 'can I backup this directory or is 
>>> someone writing to a file?'
>>
>>
>>
>> If that's what the OP had in mind, the question might have been better 
>> phrased as "given the path to a file, how can I tell if it is 
>> currently opened by another process/thread", and better directed to 
>> OS-specifc newsgroup(s).
>>
> there is a specific python function ?

If you mean "is there a Python function that given a filename, returns 
an indication of whether that file has been opened by another 
process/thread, portably across different operating systems?" then the 
answer is NO. This is what I meant by "the question might have been ... 
better directed to OS-specifc newsgroup(s)". That is what you should 
have inferred from Daniel's reply "On Linux ... probably ... On Windows 
... probably...".

If you mean something else, you might like to try rephrasing your question.
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Re: spurious syntax error when updating to 2.4 ?

[Simon Dahlbacka]

Replying to self,

it seems to be related to
https://sourceforge.net/tracker/index.php?func=detail&aid=1163244&group_id=5470&atid=105470
(Syntax error on large file with MBCS encoding)
even though my files had # -*- coding: ascii -*-
However, if I removed this explicit ascii encoding then I did not get
any syntax error.

/Simon

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Re: gdb python C API

[skip]

fraca7> derrick a écrit :
>> are there any tools / methods that others have used to get what line
>> of the python script is being executed while running in gdb? or if it
>> would actually show me the source python script (instead of the the
>> python c source) that would help.

fraca7> I don't think so, but when having a memory problem I usually
fraca7> find valgrind very useful.

Actually, take a look in the distribution at Misc/gdbinit.  In particular,
check out the pystack command.

Skip
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Re: UPDATE: SPE 0.7.4.d Python Editor released

[travlr]

I just dloaded 0.7.4.b an hour ago... your quik. Ha...lol. :-)

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Re: gdb python C API

[fraca7]

[EMAIL PROTECTED] a écrit :

> Actually, take a look in the distribution at Misc/gdbinit.  In particular,
> check out the pystack command.

Wow, nice! This will be put to good use, thanks :)
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Re: Python Path Setting

[Chris Curvey]

http://www.python.org/doc/2.4.1/inst/search-path.html#SECTION00041

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Re: Lots of pdf files

[nick]

Paul Rubin  wrote:
> Greg Lindstrom <[EMAIL PROTECTED]> writes:
> > There does not appear to be a simple way to merge many pdf's into one.

> There's probably some way to do it with pstops or some related program
> or set of programs.

Google for "multivalent tools" - a collection of Java applications
for PDF manipulation...


N.
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print pdf file to network printer using python

[scrimp]

Well, Ive been searching through google groups and Ive seen a lot about
printing a pdf file, but I havent seen a definite answer. I tried this
code:

f = open(printer_path, 'w')
f.write(pdffile_path)
f.close()

Basically it doesnt work and what it prints out is the value of
pdffile_path variable. If anyone can offer some help, Id appreaciate it
thanks!

--Barry

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Re: returning list of strings from Python COM to Visual basic 6

[Philippe C. Martin]

I guess that also means (which makes sense) that the returned object has to
be registered as a COM object.

However, in my case, I just needed that object to pass it to yet another
object, I did not need to use it from VB

Regards,

Philippe



Philippe C. Martin wrote:

> Thanks a bunch,
> 
> I'll try this, This raises two questions:
> 1) How do I declare the receiving VB variable ?
> 2) Then, can I use the returned object as a COM object: call its public
> methods (that would be hot)?
> 
> 
> Dim newobj as ?
> newobj = acom.Get_Obj()
> 
> newobj.A_Public()
> 
> 
> Regards,
> 
> Philippe
> 
> 
> 
> 
> 
> On Thursday 21 July 2005 09:55 am, Stefan Schukat wrote:
>> You have to wrap the python object with a COM object:
>>
>> def Get_Obj(self):
>> return win32com.server.util.wrap(an_object)
>>
>>
>> Stefan
>>
>> > -Original Message-
>> > From: [EMAIL PROTECTED]
>> > [mailto:[EMAIL PROTECTED] Behalf Of
>> > Philippe C. Martin
>> > Sent: Thursday, July 21, 2005 1:42 AM
>> > To: python-list@python.org
>> > Subject: Re: returning list of strings from Python COM to
>> > Visual basic 6
>> >
>> >
>> > I can now pass and return quite a few types except object
>> > instances: my
>> > python code gets to the point where I do:
>> >
>> >
>> > def Get_Obj(self):
>> > .
>> > return an_object
>> >
>> > My VB code looks like
>> >
>> > Dim obj as Variant
>> >
>> > obj = acom.Get_Obj()
>> >
>> >
>> > I get an "unexpected Python error . Objects of type
>> > 'instance' can not
>> > be converted to a COM VARIANT"
>> >
>> > Is there a way out ?
>> >
>> > Thanks,
>> >
>> > Philippe
>> >
>> > Philippe C. Martin wrote:
>> > > Hi,
>> > >
>> > > Is it possible ?
>> > >
>> > > ex: return ['1','2']
>> > >
>> > > If so which type should I use in VB ?
>> > >
>> > > dim res as ???
>> > >
>> > > Set testObj = CreateObject("")
>> > >
>> > > res = testObj.AMethodThatReturnsAListOfStrings()
>> > >
>> > >
>> > > Thanks,
>> > >
>> > > Philippe
>> >
>> > --
>> > http://mail.python.org/mailman/listinfo/python-list
>>
>> The "Leading Manufacturing Test Company of the Year 2005"
>> http://www.dspace.de/goto?f_s_award
> 

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Re: Need to interrupt to check for mouse movement

[Jp Calderone]

On Thu, 21 Jul 2005 00:51:45 -0400, Christopher Subich <[EMAIL PROTECTED]> 
wrote:
>Jp Calderone wrote:
>
>> In the particular case of wxWidgets, it turns out that the *GUI* blocks
>> for long periods of time, preventing the *network* from getting
>> attention.  But I agree with your position for other toolkits, such as
>> Gtk, Qt, or Tk.
>
>Wow, I'm not familiar with wxWidgets; how's that work?

wxWidgets' event loop doesn't differentiate between two unrelated (but similar 
sounding) concepts: blocking arbitrary input from the user (as in the case of 
modal dialogs) and blocking execution of code.

When you pop up a modal dialog, your code will not get another chance to run 
until the user dismisses it.  Similarly, as long as a menu is open, your code 
will not get to run.

Jp
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Re: Need to interrupt to check for mouse movement

[Jp Calderone]

On 20 Jul 2005 22:06:31 -0700, Paul Rubin <"http://phr.cx"@nospam.invalid> 
wrote:
>Christopher Subich <[EMAIL PROTECTED]> writes:
>> > In the particular case of wxWidgets, it turns out that the *GUI*
>> > blocks for long periods of time, preventing the *network* from
>> > getting attention.  But I agree with your position for other
>> > toolkits, such as Gtk, Qt, or Tk.
>>
>> Wow, I'm not familiar with wxWidgets; how's that work?
>
>Huh?  It's pretty normal, the gui blocks while waiting for events
>from the window system.  I expect that Qt and Tk work the same way.

But not Gtk? :)  I meant what I said: wxWidgets behaves differently in this 
regard than Gtk, Qt, and Tk.

Jp
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Re: Need to interrupt to check for mouse movement

[Jp Calderone]

On Thu, 21 Jul 2005 05:42:32 -, Donn Cave <[EMAIL PROTECTED]> wrote:
>Quoth Paul Rubin :
>| Christopher Subich <[EMAIL PROTECTED]> writes:
>| > > In the particular case of wxWidgets, it turns out that the *GUI*
>| > > blocks for long periods of time, preventing the *network* from
>| > > getting attention.  But I agree with your position for other
>| > > toolkits, such as Gtk, Qt, or Tk.
>| >
>| > Wow, I'm not familiar with wxWidgets; how's that work?
>|
>| Huh?  It's pretty normal, the gui blocks while waiting for events
>| from the window system.  I expect that Qt and Tk work the same way.
>
>In fact anything works that way, that being the nature of I/O.
>But usually there's a way to add your own I/O source to be
>dispatched along with the UI events -- the toolkit will for
>example use select() to wait for X11 socket I/O, so it can also
>respond to incoming data on another socket, provided along with a
>callback function by the application.
>
>Am I hearing that wxWindows or other popular toolkits don't provide
>any such feature, and need multiple threads for this reason?
>

Other popular toolkits do.  wxWindows doesn't.

Jp
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Re: popen2 usage

[jb]

Actually, "-test1" is a text argument that testme.exe should receive
from standard input. For example,
Executing testme.exe generates the following output,
Please select one of the following options:
1) test1
2) test2
3) exit
Please enter your option here:-test1 <-This -test1 is what user would
type

Thanks,
-JB


Steven Bethard wrote:
> jb wrote:
> > Hi there:
> >
> > I need help with popen2 usage.  I am coding on Windows 2000 environment
> > and I am basically trying to run command line executable program that
> > accepts command line arguments from user. I want to be able to provide
> > these arguments through input pipe so that executable does not require
> > any intervention from the user.  The way I am doing this is as below:
> >
> > out1, in1 = popen2.popen2("testme.exe > abc.txt")
> > in1.write('-test1')
> > in1.flush()
> > in1.close()
> >
> > But this does not seem to be working, when I open abc.txt file it does
> > not show '-test1' argument that was supplied via in1.write method. This
> > causing executable to wait forever unless user manually kills the
> > process.
>
> I'm confused; is "-test1" a command line argument to testme.exe?  Or is
> it the text that testme.exe should receive from standard input?
>
> Either way, I would suggest using subprocess instead of popen*.
>
> To pass -test1 as a command line argument, do something like:
>
> import subprocess as sp
> p = sp.Popen(["testme.exe", "-test1"], stdout=sp.PIPE)
> out1 = sp.stdout.read()
>
> To pass -test1 through standard input, do something like:
>
> import subprocess as sp
> p = sp.Popen(["testme.exe"], stdout=sp.PIPE)
> p.stdin.write("-test1")
> p.stdin.flush()
> p.stdin.close()
> out1 = p.stdout
> 
> HTH,
> 
> STeVe

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Buffering problem using subprocess module

[Dr. Who]

I am using the subprocess module in 2.4.  Here's the fragment:

bufcaller.py:
import sys, subprocess
proc = subprocess.Popen('python bufcallee.py', bufsize=0, shell=True,
stdout=subprocess.PIPE)
for line in proc.stdout:
sys.stdout.write(line)

bufcallee.py:
import time
print 'START'
time.sleep(10)
print 'STOP'

Although the documentation says that the output should be unbuffered
(bufsize=0) the program (bufcaller) pauses for 10 seconds and then
prints START immediately followed by 'STOP' rather than pausing 10
seconds in between them.  Note that I made bufcallee a Python script
for ease of the example but in the real-world problem I am trying to
solve it is simply an executable.

Any ideas?
Jeff

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Re: Need to interrupt to check for mouse movement

[Jp Calderone]

On Thu, 21 Jul 2005 02:33:05 -0400, Peter Hansen <[EMAIL PROTECTED]> wrote:
>Jp Calderone wrote:
>> In the particular case of wxWidgets, it turns out that the *GUI* blocks
>> for long periods of time, preventing the *network* from getting
>> attention.  But I agree with your position for other toolkits, such as
>> Gtk, Qt, or Tk.
>
>Are you simply showing that there are two points of view here, that one
>can look at the wx main loop as being "blocking", waiting for I/O, even
>though it is simply doing asynchronous event-driven processing the same
>as Twisted?  Or am I missing something?  Allowing for the fact that wx
>blocks, not just for long periods of time, but *indefinitely* (as long
>as no events are arriving) I still don't see how that makes it different
>from Twisted or from any other typical GUI framework, which do exactly
>the same thing.  (And since there is even a wxPython main loop
>integrated with and provided in Twisted, surely you aren't arguing that
>what wx does is somehow unusual or bad.)

Providing wx support in Twisted has been orders of magnitude more difficult 
than providing Tk, Qt, or Gtk support has been.  And wxsupport and wxreactor 
are each broken in slightly different ways, so I wouldn't say we've been 
successful, either.

Blocking inside the mainloop while waiting for events is fine.  It's blocking 
elsewhere that is problematic.

Jp
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Listing Processes Running on Remote Machines

[yoda]

Hello Hackers,
I'm developing a large scale distributed service and part of the
requirement is that I be able to monitor clients in a very granular
way.

To this end, I'd like to know if there is any way to get a list of all
the processes running on a remote client\machine.  I need to be able to
do this on demand. (i.e on user demand)

Please note that the clients run heterogeneous operating systems mainly
Linux and Windows2000\XP

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Re: Buffering problem using subprocess module

[Jp Calderone]

On 21 Jul 2005 06:14:25 -0700, "Dr. Who" <[EMAIL PROTECTED]> wrote:
>I am using the subprocess module in 2.4.  Here's the fragment:
>
>bufcaller.py:
>   import sys, subprocess
>   proc = subprocess.Popen('python bufcallee.py', bufsize=0, shell=True,
>stdout=subprocess.PIPE)
>   for line in proc.stdout:
>   sys.stdout.write(line)
>
>bufcallee.py:
>   import time
>   print 'START'
>   time.sleep(10)
>   print 'STOP'
>
>Although the documentation says that the output should be unbuffered
>(bufsize=0) the program (bufcaller) pauses for 10 seconds and then
>prints START immediately followed by 'STOP' rather than pausing 10
>seconds in between them.  Note that I made bufcallee a Python script
>for ease of the example but in the real-world problem I am trying to
>solve it is simply an executable.
>
>Any ideas?

There are a few places buffering can come into play.  The bufsize parameter to 
Popen() controls buffering on the reading side, but it has no effect on 
buffering on the writing side.  If you add a sys.stdout.flush() after the 
prints in the child process, you should see the bytes show up immediately.  
Another possibility is to start Python in unbuffered mode (pass the -u flag, or 
set PYTHONUNBUFFERED in the environment), but obviously this only applies to 
Python programs.  Still another possibility (generally the nicest) is to use a 
PTY instead of a pipe: when the C library sees stdout is a pipe, it generally 
decides to put output into a different buffering mode than when it sees stdout 
is a pty.  I'm not sure how you use ptys with the subprocess module.

Hope this helps,

Jp
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RE: Listing Processes Running on Remote Machines

[George Flaherty]

Look into STAF http://staf.sourceforge.net/index.php

-g

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of yoda
Sent: Thursday, July 21, 2005 9:23 AM
To: python-list@python.org
Subject: Listing Processes Running on Remote Machines

Hello Hackers,
I'm developing a large scale distributed service and part of the requirement is 
that I be able to monitor clients in a very granular way.

To this end, I'd like to know if there is any way to get a list of all the 
processes running on a remote client\machine.  I need to be able to do this on 
demand. (i.e on user demand)

Please note that the clients run heterogeneous operating systems mainly Linux 
and Windows2000\XP

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Re: wxPythin installation woes

[linuxfreak]

Does anyone know if the same can be done in fedora distributions???



Sybren Stuvel wrote:
> linuxfreak enlightened us with:
> > Turns out that  libstdc++.so.5 is needed but I checked and i see
> > that libstdc++.so.6 is installed on my system.
>
> On my system (Ubuntu, based on Debian), I can have multiple versions
> of libstdc++ installed at the same time.
>
> Sybren
> --
> The problem with the world is stupidity. Not saying there should be a
> capital punishment for stupidity, but why don't we just take the
> safety labels off of everything and let the problem solve itself?
>  Frank Zappa

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Re: Filling up commands.getstatusoutput's buffer

[Jeff Epler]

On Wed, Jul 20, 2005 at 03:10:49PM -0700, [EMAIL PROTECTED] wrote:
> Hey,
> 
> Has anyone ever had commands.getstatusoutput's buffer fill up when
> executing a verbose command? [...]

How much output are you talking about?  I tried outputs as large as
about 260 megabytes without any problem. (RedHat 9, Python 2.2)

>>> len(commands.getoutput("dd if=/dev/zero bs=512 count=512000 2>/dev/null"))
262144000
>>> 512 * 512000
262144000

Jeff


pgpwMseDka1nF.pgp
Description: PGP signature
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Re: is this pythonic?

[Steven D'Aprano]

On Wed, 20 Jul 2005 16:30:10 -0400, Bill Mill wrote:

> On 7/20/05, Simon Brunning <[EMAIL PROTECTED]> wrote:
>> On 7/20/05, Mage <[EMAIL PROTECTED]> wrote:
>> > Or is there better way?
>> >
>> > for (i, url) in [(i,links[i]) for i in range(len(links))]:
>> 
>> for i, url in enumerate(links):
>> 
> 
> +2 for creating seeing a need and crafting a reasonable solution, but
> -1 for not reading the section on builtins to see if it existed
> already.

To see if *what* existed already?

It is well and good to say RTFM, but there are 697 subsections to the
Python Library reference, and if you don't know what you are looking for,
and beginners rarely are, it isn't obvious which is the right section to
read. And the Library Reference isn't even "the" manual: there is also the
global module reference and language reference.

If you already know what you are looking for, reading the manual is great
advice. Browsing the manual looking for interesting tidbits can even be
fun for a certain mindset. But if you don't know enough to know what to
look for, where in the 2000-odd sections of the Python references will
you find it?



> (As for its pythonicity, I would have recommended isolating it into a
> function and making it a generator:

It is easy to take this to extremes. It isn't necessary to isolate
everything into its own object, or class, or module. Too much
encapsulation is just as bad as too little.


> def my_enumerate(enumerable):
> i = 0
> for elt in enumerable:
> yield (i, elt)
> i += 1
> 
> for i, url in my_enumerate(links):
> 
> but it's not too bad as it is. Also, my function is completely
> untested - it's close to right though.)

What is the advantage of your function my_enumerate over the Python
built-in enumerate?


-- 
Steven.

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Re: goto

[Rocco Moretti]

> My "favorite" infinte loop with while is:
> 
>i = 0
>while i < 20:
>  do_process(i)
> 
> Note the prominent *lack* of any change to i here?
> 
> Oh, for:
> 
> from i = 0
> invariant 0 <= i <= 20
> variant 21 - i
> until i > 19
> loop
> do_process(i)
> 
> which throws an exception at the beginning of the second loop.

What language is that from?

I take it the exception is from the "21-i" not changing as it goes 
around the loop, right? (But why can't "variant i" work just as well?)
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Dr. Dobb's Python-URL! - weekly Python news and links (Jul 20)

[Simon Brunning]

QOTW: "Discussing goto statements and Microsoft together is like mixing
dynamite and gasoline." - DH

'"Spaghetti" doesn't quite describe it. I've settled on "Lovecraftian":
reading the code, you can't help but get the impression of writhing
tentacles and impossible angles.' - Robert Kern


Highlight of the week; Jython 2.2a1:

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/9c3b6b2e10d8a490

Nearly-highlight of the week; Simon Willison introduces Django, the
web framework for perfectionists with deadlines:
http://simon.incutio.com/archive/2005/07/17/django

But Jeff Shell remains more impressed with Subway:
http://griddlenoise.blogspot.com/2005/07/python-off-rails.html

CherryPy-2.1.0-beta released:

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/18f2e97ab515891

With all this web framework activity, what are people using?

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/63bdf6b93e1704d3

Bob Ippolito wonders; what happened to YAML?
http://bob.pythonmac.org/archives/2005/07/19/what-happened-to-yaml/

MKoool (!) is looking for the simplest way of stripping non-printable
characters from text:

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/23d6fdc3c9148725

Discovering WSGI and XSLT as middleware

http://www.decafbad.com/blog/2005/07/18/discovering_wsgi_and_xslt_as_middleware

Is there any worthwhile Python certification available? Is there any
worthwhile certification at all?

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/49dc79507ca4567d

Microsoft's very own Python scripts:

http://www.microsoft.com/technet/scriptcenter/scripts/python/pyindex.mspx

Another notable release; python-dateutil 1.0:

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/7d0f044f1a3c8959



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  
Mygale is a news-gathering webcrawler that specializes in (new)
World-Wide Web articles related to Python.
 http://www.awaretek.com/nowak/mygale.html 
While cosmetically similar, Mygale and the Daily Python-URL
are utterly different in their technologies and generally in
their results.

For far, FAR more Python reading than any one mind should
absorb, much of it quite interesting, several pages index
much of the universe of Pybloggers.
http://lowlife.jp/cgi-bin/moin.cgi/PythonProgrammersWeblog
http://www.planetpython.org/
http://mechanicalcat.net/pyblagg.html

comp.lang.python.announce announces new Python software.  Be
sure to scan this newsgroup weekly.

http://groups.google.com/groups?oi=djq&as_ugroup=comp.lang.python.announce

Steve Bethard, Tim Lesher, and Tony Meyer continue the marvelous
tradition early borne by Andrew Kuchling, Michael Hudson and Brett
Cannon of intelligently summarizing action on the python-dev mailing
list once every other week.
http://www.python.org/dev/summary/

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/donate.html

Kurt B. Kaiser publishes a weekly report on faults and patches.
http://www.google.com/groups?as_usubject=weekly%20python%20patch
   
Cetus collects Python hyperlinks.
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.
   

Re: is this pythonic?

[Bill Mill]

On 7/21/05, Steven D'Aprano <[EMAIL PROTECTED]> wrote:
> On Wed, 20 Jul 2005 16:30:10 -0400, Bill Mill wrote:
> 
> > On 7/20/05, Simon Brunning <[EMAIL PROTECTED]> wrote:
> >> On 7/20/05, Mage <[EMAIL PROTECTED]> wrote:
> >> > Or is there better way?
> >> >
> >> > for (i, url) in [(i,links[i]) for i in range(len(links))]:
> >>
> >> for i, url in enumerate(links):
> >>
> >
> > +2 for creating seeing a need and crafting a reasonable solution, but
> > -1 for not reading the section on builtins to see if it existed
> > already.
> 
> To see if *what* existed already?
> 
> It is well and good to say RTFM, but there are 697 subsections to the
> Python Library reference, and if you don't know what you are looking for,
> and beginners rarely are, it isn't obvious which is the right section to
> read. And the Library Reference isn't even "the" manual: there is also the
> global module reference and language reference.
> 
> If you already know what you are looking for, reading the manual is great
> advice. Browsing the manual looking for interesting tidbits can even be
> fun for a certain mindset. But if you don't know enough to know what to
> look for, where in the 2000-odd sections of the Python references will
> you find it?
> 

I said the *builtins* section. I think you learn pretty quick that
figuring out what functions are builtins is pretty important in every
language. There's a fair number of people out there giving the advice
to read chapter 2 of the library reference cover-to-cover for a good
starter on python.

Furthermore, I wasn't being hard on the guy, he still added up to +1.
Lighten up, I was joking.

> 
> 
> > (As for its pythonicity, I would have recommended isolating it into a
> > function and making it a generator:
> 
> It is easy to take this to extremes. It isn't necessary to isolate
> everything into its own object, or class, or module. Too much
> encapsulation is just as bad as too little.
> 

agreed; his listcomp just looks awkward inside the for loop statement;
if it were my code, I would put it into a function. He asked if his
code was pythonic, and I think the (non-extreme) pythonic thing to do
would be to put his listcomp into a function.

> 
> > def my_enumerate(enumerable):
> > i = 0
> > for elt in enumerable:
> > yield (i, elt)
> > i += 1
> >
> > for i, url in my_enumerate(links):
> >
> > but it's not too bad as it is. Also, my function is completely
> > untested - it's close to right though.)
> 
> What is the advantage of your function my_enumerate over the Python
> built-in enumerate?
> 
> 

absolutely none; I just was saying how I would encapsulate it into a function.

Peace
Bill Mill
bill.mill at gmail.com
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Python session handling

[mohammad babaei]

Hi,
What is th best way for "session  tracking" in python ?

regards,
mo
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Stupid question: Making scripts python-scripts

[Jan Danielsson]

Hello all,

   How do I make a python script actually a _python_ in unix:ish
environments?

I know about adding:
#!/bin/sh

   ..as the first row in a shell script, but when I installed python on
a NetBSD system, I didn't get a "python" executable; only a "python2.4"
executable.

   Adding "#!/usr/pkg/bin/python2.4" as the first row in the script
would probably work, but that would be too specific for the system I'm
using, imho.

   I saw someone using "#!/usr/bin/env python", but that failed on the
system I'm using, so I assume that's something specific too (or is the
installation broken?).
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Re: Stupid question: Making scripts python-scripts

[Jp Calderone]

On Thu, 21 Jul 2005 16:34:30 +0200, Jan Danielsson <[EMAIL PROTECTED]> wrote:
>Hello all,
>
>   How do I make a python script actually a _python_ in unix:ish
>environments?
>
> [snip]

Put "#!/usr/bin/python".  Install the program using distutils: if necessary, 
distutils will rewrite the #! line to fit the configuration of the system the 
program is being installed on.

Jp
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Overriding a built-in exception handler

[callmebill]

I'm having a tough time figuring this one out:


class MyKBInterrupt( . ):
   print "Are you sure you want to do that?"

if __name__ == "__main__":
   while 1:
   print "Still here..."


So this thing keeps printing "Still here..." until the user hits ctl-c,
at which time the exception is passed to MyKBInterrupt to handle the
exception, rather than to whatever the built-in handler would be.

I've Read-TFM, but I only see good info on how to create my own class
of exception;  I don't see anything on how to override an existing
exception handler.

Thanks in advance for any help.

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Re: Stupid question: Making scripts python-scripts

[callmebill]

On your system, do:
which python2.4

That will give you the full path to the python2.4 binary (let's call it
"path/to/py24").

Then add:
#!/path/to/py24

...to the top of your script.

And make sure the file is chmod'd +x

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Re: Overriding a built-in exception handler

[Jp Calderone]

On 21 Jul 2005 07:39:10 -0700, [EMAIL PROTECTED] wrote:
>I'm having a tough time figuring this one out:
>
>
>class MyKBInterrupt( . ):
>   print "Are you sure you want to do that?"
>
>if __name__ == "__main__":
>   while 1:
>   print "Still here..."
>
>
>So this thing keeps printing "Still here..." until the user hits ctl-c,
>at which time the exception is passed to MyKBInterrupt to handle the
>exception, rather than to whatever the built-in handler would be.
>
>I've Read-TFM, but I only see good info on how to create my own class
>of exception;  I don't see anything on how to override an existing
>exception handler.
>
>Thanks in advance for any help.

See excepthook in the sys module documentation: 

  http://python.org/doc/lib/module-sys.html

Jp
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Re: Stupid question: Making scripts python-scripts

[Bill Mill]

On 7/21/05, Jan Danielsson <[EMAIL PROTECTED]> wrote:
> Hello all,
> 
>How do I make a python script actually a _python_ in unix:ish
> environments?
> 
> I know about adding:
> #!/bin/sh
> 
>..as the first row in a shell script, but when I installed python on
> a NetBSD system, I didn't get a "python" executable; only a "python2.4"
> executable.
> 
>Adding "#!/usr/pkg/bin/python2.4" as the first row in the script
> would probably work, but that would be too specific for the system I'm
> using, imho.
> 
>I saw someone using "#!/usr/bin/env python", but that failed on the
> system I'm using, so I assume that's something specific too (or is the
> installation broken?).

The env program [1], which usually exists at least on a linux system,
executes the program given as its argument. Thus, "/usr/bin/env
python" tries to executes python, which bash will then use to run the
python script. As long as env exists, and python is somewhere in the
PATH, this is a fairly portable way to run python scripts.

Does BSD really not come with the env program? I bet there's an
equivalent you could symlink to it. Unfortunately, I've never BSDed,
so I can't help you find it. To get a workable subset of the normal
env functionality, you could try (assuming you use bash):

/home/llimllib $ echo "$@" > /usr/bin/env
/home/llimllib $ chmod a+x /usr/bin/env

Peace
Bill Mill
bill.mill at gmail.com

[1]: http://rootr.net/man/man/env/1
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Re: Overriding a built-in exception handler

[Jaime Wyant]

You can't override an exception.  You can only catch whatever
exception is thrown.

For your case, you would want to wrap that while loop up in a
try/catch block like this:

try:
while 1:
print "Yay for me!"
except KeyboardInterrupt:
print "CTRL-C caught"

Someone had mentioned possibly overriding sys.excepthook, but that
doesn't really "override" an exception handler.  That function is
called when an unhandled exception occurs.  That little hook is really
nice if you want to display information back to the user and possibly
report the info back to a server somewhere.

jw

On 21 Jul 2005 07:39:10 -0700, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
> I'm having a tough time figuring this one out:
> 
> 
> class MyKBInterrupt( . ):
>print "Are you sure you want to do that?"
> 
> if __name__ == "__main__":
>while 1:
>print "Still here..."
> 
> 
> So this thing keeps printing "Still here..." until the user hits ctl-c,
> at which time the exception is passed to MyKBInterrupt to handle the
> exception, rather than to whatever the built-in handler would be.
> 
> I've Read-TFM, but I only see good info on how to create my own class
> of exception;  I don't see anything on how to override an existing
> exception handler.
> 
> Thanks in advance for any help.
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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Re: Stupid question: Making scripts python-scripts

[Bill Mill]

On 7/21/05, Bill Mill <[EMAIL PROTECTED]> wrote:
> On 7/21/05, Jan Danielsson <[EMAIL PROTECTED]> wrote:
> > Hello all,
> >
> >How do I make a python script actually a _python_ in unix:ish
> > environments?
> >
> > I know about adding:
> > #!/bin/sh
> >
> >..as the first row in a shell script, but when I installed python on
> > a NetBSD system, I didn't get a "python" executable; only a "python2.4"
> > executable.
> >
> >Adding "#!/usr/pkg/bin/python2.4" as the first row in the script
> > would probably work, but that would be too specific for the system I'm
> > using, imho.
> >
> >I saw someone using "#!/usr/bin/env python", but that failed on the
> > system I'm using, so I assume that's something specific too (or is the
> > installation broken?).
> 
> The env program [1], which usually exists at least on a linux system,
> executes the program given as its argument. Thus, "/usr/bin/env
> python" tries to executes python, which bash will then use to run the
> python script. As long as env exists, and python is somewhere in the
> PATH, this is a fairly portable way to run python scripts.
> 
> Does BSD really not come with the env program? I bet there's an
> equivalent you could symlink to it. Unfortunately, I've never BSDed,
> so I can't help you find it. To get a workable subset of the normal
> env functionality, you could try (assuming you use bash):
> 
> /home/llimllib $ echo "$@" > /usr/bin/env
> /home/llimllib $ chmod a+x /usr/bin/env
> 

ahhh, that should be:

/home/llimllib $ echo "\$@" > /usr/bin/env

otherwise bash tries to substitute into the string. Sorry bout that.

Peace
Bill Mill
bill.mill at gmail.com
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difficulty connecting to networked oracle database

[yahibble]

Now, I am no Python expert but I have dabbled and I have spent a
couple of days with another engineer unsuccessfully installing oracle
drivers for MS ODBC on the win XP machine.

It looked to me like ODBC was the best way to get a (free) python
module to upload data to an oracle database table. Aside from
installing oracle clients to ODBC being a pain, I would like to
consider other ways to connect.

Has anyone had experiences with Python connecting to oracle from Win
XP? I have searched the 'net for various modules and discussions but
have no success thus far.

Thanks, Graeme.


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Re: difficulty connecting to networked oracle database

[Paul McNett]

yahibble wrote:
> Now, I am no Python expert but I have dabbled and I have spent a
> couple of days with another engineer unsuccessfully installing oracle
> drivers for MS ODBC on the win XP machine.
> 
> It looked to me like ODBC was the best way to get a (free) python
> module to upload data to an oracle database table. Aside from
> installing oracle clients to ODBC being a pain, I would like to
> consider other ways to connect.
> 
> Has anyone had experiences with Python connecting to oracle from Win
> XP? I have searched the 'net for various modules and discussions but
> have no success thus far.

I don't have specific experience with Oracle and Python, but I do know 
that using Python's DB-API is usually the best way to go. For Oracle, 
everyone seems to be using cx_oracle, a Python package freely 
downloadable from:

http://www.computronix.com/utilities.shtml

ODBC isn't really the best solution for Python programs.

-- 
Paul McNett
http://paulmcnett.com

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Re: difficulty connecting to networked oracle database

[Martin Franklin]

yahibble wrote:
> Now, I am no Python expert but I have dabbled and I have spent a
> couple of days with another engineer unsuccessfully installing oracle
> drivers for MS ODBC on the win XP machine.
> 
> It looked to me like ODBC was the best way to get a (free) python
> module to upload data to an oracle database table. Aside from
> installing oracle clients to ODBC being a pain, I would like to
> consider other ways to connect.
> 
> Has anyone had experiences with Python connecting to oracle from Win
> XP? I have searched the 'net for various modules and discussions but
> have no success thus far.
> 
> Thanks, Graeme.
> 
> 


not used it on Windows XP (just 2000) but cx_Oracle worked for me

http://sourceforge.net/projects/cx-oracle/

Martin

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Re: What does "::" mean?

[Michael Hoffman]

Robert Kern wrote:
> Rob Williscroft wrote:
> 
>> import sys
>>
>> live = 'live'
>>
>> print live[ sys.maxint  :  : -1 ]
>> print live[ len(live)-1 :  : -1 ]
>>
>> print live[ len(live)-1 : -len(live)-1 : -1 ]
>> print live[ len(live)-1 : -sys.maxint  : -1 ]
>> print live[ sys.maxint  : -sys.maxint  : -1 ]
>> print live[ -1  : -len(live)-1 : -1 ]
>>
>> Of course there is only one obvious way to do it, but alas
>> as I'm not Dutch I can't tell which it is.
> 
> Well, that part's easy at least:
> 
>   live[::-1]
> 
> :-)  And so the circle is complete ...

What about reversed(live)? Or if you want a list instead of an iterator, 
list(reversed(live))?
-- 
Michael Hoffman
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PEP on path module for standard library

[Michael Hoffman]

Many of you are familiar with Jason Orendorff's path module 
, which is frequently 
recommended here on c.l.p. I submitted an RFE to add it to the Python 
standard library, and Reinhold Birkenfeld started a discussion on it in 
python-dev 
.

The upshot of the discussion was that many python-dev'ers wanted path 
added to the stdlib, but Guido was not convinced and said it must have a 
PEP. So Reinhold and I are going to work on one. Reinhold has already 
made some changes to the module to fit the python-dev discussion and put 
it in CPython CVS at nondist/sandbox/path.

For the PEP, do any of you have arguments for or against including path? 
Code samples that are much easier or more difficult with this class 
would also be most helpful.

I use path in more of my modules and scripts than any other third-party 
module, and I know it will be very helpful when I no longer have to 
worry about deploying it.

Thanks in advance,
-- 
Michael Hoffman
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Hash functions

[Steven D'Aprano]

Do people often use hash() on built-in types? What do you find it useful
for?

How about on custom classes? Can anyone give me some good tips or hints
for writing and using hash functions in Python?

Thank you,


-- 
Steven.

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Re: goto

[Michael Hudson]

[EMAIL PROTECTED] writes:

> >>> what is the equivalent of C languages' goto  statement in python?
> 
> >> You really shouldn't use goto.
> >> Fortunately you can't.
> 
> Steven> Of course you can :-)
> 
> Steven> You can write your own Python interpreter, in Python, and add a
> Steven> goto to it.
> 
> Maybe easier would be to write a Python assembler (there's probably already
> one out there) and just write to Python's virtual machine...

The blockstack gets in the way.

Really, I think Richie's goto module is about as "good" as it can get
without vm surgery (apart from the performance, I'd guess).

Cheers,
mwh

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  to young and budding programmers: it can give you exactly the wrong
  idea about the technical issues it raises.
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Re: Stupid question: Making scripts python-scripts

[callmebill]

oops... I missed the "too specific comment."  Sorry =)

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Re: is this pythonic?

[Michael Hoffman]

Steven D'Aprano wrote:

> The great thing about Usenet and the Internet is that we can pick each
> other's brains for answers, instead of flailing around blindly in manuals
> that don't understand the simplest natural language query. And isn't that
> why we're here?

Personally, I feel my time is better served by answering questions that 
would not be easy to find without assistance. I can't expect everyone to 
know about or expect enumerate() from the beginning, so I don't have any 
objections to it being asked here.

If people were to ask what the function signature for enumerate() was 
when that is easy to Google, then I would think they were wasting 
everyone's time.
-- 
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Re: Need to interrupt to check for mouse movement

[Christopher Subich]

Paul Rubin wrote:
> Huh?  It's pretty normal, the gui blocks while waiting for events
> from the window system.  I expect that Qt and Tk work the same way.

Which is why I recommended Twisted for the networking; it integrates 
with the toolkit event loops so it automagically works: 
http://twistedmatrix.com/projects/core/documentation/howto/choosing-reactor.html#auto15

I agree, though, that basic socket programming in the same thread as the 
gui's probably a bad idea.
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Re: Stupid question: Making scripts python-scripts

[callmebill]

You could also set your "python" environment variable on the system...
set it to be "/path/to/python2.4".  Then use the "#!/usr/bin/env
python" trick.  Just make sure that env is working for you, first.

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Re: print pdf file to network printer using python

[Grant Edwards]

On 2005-07-21, scrimp <[EMAIL PROTECTED]> wrote:
> Well, Ive been searching through google groups and Ive seen a lot about
> printing a pdf file, but I havent seen a definite answer. I tried this
> code:
>
> f = open(printer_path, 'w')
> f.write(pdffile_path)
> f.close()
>
> Basically it doesnt work and what it prints out is the value of
> pdffile_path variable. If anyone can offer some help, Id appreaciate it
> thanks!

You forgot to read the data from the pdf file.

f = open(printer_path, 'w')
f.write(open(pdffile_path,'rb').read())
f.close()

-- 
Grant Edwards   grante Yow!  Yow! It's a hole
  at   all the way to downtown
   visi.comBurbank!
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Re: is this pythonic?

[Steven D'Aprano]

On Thu, 21 Jul 2005 16:43:00 +0100, Michael Hoffman wrote:

> Personally, I feel my time is better served by answering questions that 
> would not be easy to find without assistance. I can't expect everyone to 
> know about or expect enumerate() from the beginning, so I don't have any 
> objections to it being asked here.
> 
> If people were to ask what the function signature for enumerate() was 
> when that is easy to Google, then I would think they were wasting 
> everyone's time.

And on that, I think we can agree!


-- 
Steven.

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Re: Filling up commands.getstatusoutput's buffer

[travislspencer]

Jeff Epler wrote:
> On Wed, Jul 20, 2005 at 03:10:49PM -0700, [EMAIL PROTECTED] wrote:
> How much output are you talking about?

Honestly, I don't know.  I came on to a project were they said they
were hitting up against some limit, and had a hack to work around it.
I just wondered if others had hit some limit too and found diffrent
workarounds.

> I tried outputs as large as
> about 260 megabytes without any problem. (RedHat 9, Python 2.2)
>
> >>> len(commands.getoutput("dd if=/dev/zero bs=512 count=512000 2>/dev/null"))
> 262144000
> >>> 512 * 512000
> 262144000

I tried the same tests on CentOS, Python 2.3.4 and on Solaris 9 w/
Python 2.3.3.  No problems.  

--

Regards,

Travis Spencer

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Re: Overriding a built-in exception handler

[Michael Hoffman]

[EMAIL PROTECTED] wrote:

> I've Read-TFM, but I only see good info on how to create my own class
> of exception;  I don't see anything on how to override an existing
> exception handler.

You need to read the tutorial on handling exceptions:

http://docs.python.org/tut/node10.html
-- 
Michael Hoffman
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Re: is this pythonic?

[Steven D'Aprano]

On Thu, 21 Jul 2005 10:27:24 -0400, Bill Mill wrote:

[snip]

> I said the *builtins* section. I think you learn pretty quick that
> figuring out what functions are builtins is pretty important in every
> language. There's a fair number of people out there giving the advice
> to read chapter 2 of the library reference cover-to-cover for a good
> starter on python.

Sure. But for a beginner to start learning the language by reading the
language manual is a bit much to ask. Some people can do it, but most
learn best by doing, not by reading dry, abstract descriptions of what
various functions do. In my experience, iterators and generators don't
even make sense until you've spent some time playing with them.

> Furthermore, I wasn't being hard on the guy, he still added up to +1.
> Lighten up, I was joking.

There is no need to get defensive, I was merely commenting on the need to
understand that inexperienced programmers often don't know enough about
the language to know where to start looking for the answer.

In fact, it isn't just inexperienced programmers, but experienced
programmers too. I'm sure Guido doesn't need to look up enumerate in the
reference manual; but if he wanted to write a program to calculate the
positions of the anti-nodes of vibratory modes of the bound-state of a
muon and a proton/neutron pair, the odds are pretty good he wouldn't even
know where to start looking either :-)

The great thing about Usenet and the Internet is that we can pick each
other's brains for answers, instead of flailing around blindly in manuals
that don't understand the simplest natural language query. And isn't that
why we're here?



Regards,



-- 
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Re: Hash functions

[Michael Hudson]

Steven D'Aprano <[EMAIL PROTECTED]> writes:

> Do people often use hash() on built-in types? 

Only implicitly.

> What do you find it useful for?

Dictionaries :)

> How about on custom classes?

Same here.

> Can anyone give me some good tips or hints for writing and using
> hash functions in Python?

Well, the usual tip for writing them is, don't, unless you need to.

If implement __eq__, then you need to, so it's fairly common to just
hash a tuple containing the things that are considered by the __eq__
method.  Something like:

class C(object):
def __init__(self, a, b, c):
self.a = a
self.b = b
self.c = c
def __eq__(self, other):
return self.a == other.a and self.b == other.b
def __hash__(self):
return hash((self.a, self.b))

Cheers,
mwh

-- 
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  hitting with a great big slapping machine.
   -- Colin Davidson, cam.misc
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Re: What does "::" mean?

[Robert Kern]

Michael Hoffman wrote:
> Robert Kern wrote:

>>Well, that part's easy at least:
>>
>>  live[::-1]
>>
>>:-)  And so the circle is complete ...
> 
> What about reversed(live)? Or if you want a list instead of an iterator, 
> list(reversed(live))?

That's fine if you want to iterate over it. Often, especially with 
strings, you just want an object of the same type back again.

-- 
Robert Kern
[EMAIL PROTECTED]

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter

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Re: difficulty connecting to networked oracle database

[Grig Gheorghiu]

As the other posters already mentioned, cx_Oracle is the way to go. I'm
using it to connect to Oracle not only on Windows, but also on Solaris,
Linux and AIX.

Grig

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Re: PEP on path module for standard library

[Peter Hansen]

Michael Hoffman wrote:
> For the PEP, do any of you have arguments for or against including path? 
> Code samples that are much easier or more difficult with this class 
> would also be most helpful.

I believe the strongest argument for "path" can be made for how it 
integrates functionality which, although closely related conceptually, 
is currently distributed across a half dozen or more different modules 
in the standard library.  Especially for newbies (I can only imagine, at 
this stage) it would make working with files much easier in a many ways.

"Easier" or "more difficult" is a subjective thing, of course, but one 
can't argue with the fact that path can sometimes do through a single 
object what would otherwise require several imports and a bunch of calls 
into things like open(), os.path, grep, and shutil.

Examples showing effective uses of path that simplify those cases would 
probably merit the label "easier" even in Guido's mind, though 
unfortunately that's not certain.  "Easier" in some minds might simply 
translate to "many lines less code", and while path can sometimes do 
that, aside from the ease of splitting and joining stuff without 
multiple calls to os.path.this-and-that, it really doesn't often reduce 
code size _that_ much, in my experience.  (Postings to c.l.p showing a 
50% reduction in code size for contrived examples notwithstanding.)

A related thoughts: since paths are objects, they have attributes or 
properties, and having things like ".basename" and ".parent" readily 
available without having to do obscure things like 
os.path.split(somepath)[0] makes things much easier to read (therefore 
more maintainable).  In fact, I'd propose that as another strong 
argument in path's favour: it makes code much more readable, even if not 
"easier" to write.

Hmm... does "easier" or "more difficult" apply to the writing of the 
code or the reading of it?  I find it self-evident that code written 
using "path" is much easier to read, not necessarily much easier to 
write (for non-newbies).

I'd summarize this by saying that the integration of "path" in the 
stdlib would make it easier for newbies to write code (that might not be 
obvious to a non-newbie... shall we ask some to help?), and easier for 
everyone to read code (self-evident, no?), and if that's not a 
sufficient condition for inclusion I don't know what is.

-Peter
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Re: Generating images with text in them

[phil hunt]

On Thu, 21 Jul 2005 11:23:46 +0100, Daren Russell <[EMAIL PROTECTED]> wrote:
>phil hunt wrote:
>> I am trying to generate some images (gifs or pngs) with text in 
>> them. I can use the Python Imaging Library, but it only has access 
>> to the default, rather crappy, font. 
>> 
>> Ideally I'd like to use one of the nicer fonts that come with my X 
>> Windows installation. Using Tkinter I can draw these fonts on the 
>> screen; is there any way to get these fonts into a bitmapped image?
>> For example, can I draw some text on a canvas and then "grab" that 
>> canvas as a bitmap into PIL, and then save it as a file?
>> 
>> Alternately, is there a good source of PIL font files (.pil files)
>> somewhere?
>> 
>> If the writers of the Python Imaging Library are reading this, may I 
>> suggest that they add more fonts to it. Yes, that would increase 
>> the size, but these days disk space is cheap and programmer time
>> expensive.
>> 
>
>I've just been playing around with this.  You can use truetype fonts with:
>
>font = ImageFont.truetype("/path/to/font.ttf", 12)

Thanks! it's working now!

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Re: Generating images with text in them

[phil hunt]

On Thu, 21 Jul 2005 02:44:03 -0500, Terry Hancock <[EMAIL PROTECTED]> wrote:
>On Wednesday 20 July 2005 11:59 pm, phil hunt wrote:
>> I am trying to generate some images (gifs or pngs) with text in 
>> them. I can use the Python Imaging Library, but it only has access 
>> to the default, rather crappy, font.
>
>On the fly, or just during development?

Just during development.

>In any case, you should be aware of the Skencil vector graphic
>program which is written in Python (with some C extensions),
>and which is also, of course, a python vector-graphics library.

I may look that up, if I don't get joy with PIL or Tkinter.

>Unfortunately, getting it to work in a server environment might
>not be too pretty (requires GTK, etc, even if you don't actually
>use it).  I tried to make a stripped down version that didn't
>require the desktop stuff, but it hasn't worked out so well yet.

I'm runnnig a desktop environment. For example Tkinter works fine.

>> Alternately, is there a good source of PIL font files (.pil files)
>> somewhere?
>
>I believe there is a utility for converting other types of fonts, you
>might have to go through a couple of different conversions from
>the font files you have.

I'm aware there's a utility, and I wish to avoid the hassle of
"go[ing] through a couple of different conversions from the font
files you have"

>> If the writers of the Python Imaging Library are reading this, may I 
>> suggest that they add more fonts to it. Yes, that would increase 
>> the size, but these days disk space is cheap and programmer time
>> expensive.
>
>While bitmap font files are not copyrightable, there are license issues
>with most of the "nicer" fonts you are probably talking about.

Oh? I can understand them being copyrighted; but if they are not 
copywritable, what licnese issues are there? In any case, there 
presumably are not license issues with the fonts that come with a 
standard GNU/Linux distribution such as SuSE 9.1, which is what I am 
using.

> That
>complicates bundling them with the software. The PIL site does
>actually have some additional fonts for download, though, IIRC.

Do yuo have a URL?

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Re: PEP on path module for standard library

[Fernando Perez]

Peter Hansen wrote:

> Michael Hoffman wrote:
>> For the PEP, do any of you have arguments for or against including path?
>> Code samples that are much easier or more difficult with this class
>> would also be most helpful.
> 
> I believe the strongest argument for "path" can be made for how it
> integrates functionality which, although closely related conceptually,
> is currently distributed across a half dozen or more different modules
> in the standard library.  Especially for newbies (I can only imagine, at
> this stage) it would make working with files much easier in a many ways.

+10

One of the few things that annoys me about the stdlib is what one could call
performing 'shell-scripting-like' tasks, and precisely because of the problem
you point out.  A number of conceptually related and common tasks are
scattered all over, and every time I need to write this kind of code, I find
myself paging over the docs for multiple modules, with no real intuition as to
where I could even guess where to find things.  This is very unusual for
python, where in most cases things are so well organized, that blind guessing
tends to work remarkably well.  

Personally I like the path module _a lot_, though I'm sure a thorough once-over
from c.l.py and python-dev, via a PEP, can only make it better and smooth out
hidden rough edges and corner cases.  But I'll be very happy if it does go
into the stdlib in the future.

Just my .02.

Best,

f

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Re: socket programming

[Helge Aksdal]

* gry@ll.mit.edu  [2005/07/20 15:26]:

> What I have done in similar circumstances is put in a random sleep
> between connections to fool the server's load manager.  Something like:
> 
> .import time
> .min_pause,max_pause = (5.0, 10.0) #seconds
> .while True:
> .   time.sleep(random.uniform(min_pause, max_pause))
> .   do_connection_and_query_stuff()
> 
> It works for me.  Just play with the pause parameters until it fails
> and add a little.

thanks, this worked for me too. slows down the program, but at least
it works. :)

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Re: PEP on path module for standard library

[Reinhold Birkenfeld]

FYI: I modified the path module a bit so that it fits many of the suggestions
from python-dev, and put the result in the Python CVS tree under
nondist/sandbox/path.

Most prominent change is that it doesn't inherit from str/unicode anymore.
I found this distinction important, because as a str subclass the Path object
has many methods that don't make sense for it.

Peter Hansen wrote:
> Michael Hoffman wrote:
>> For the PEP, do any of you have arguments for or against including path? 
>> Code samples that are much easier or more difficult with this class 
>> would also be most helpful.
> 
> I believe the strongest argument for "path" can be made for how it 
> integrates functionality which, although closely related conceptually, 
> is currently distributed across a half dozen or more different modules 
> in the standard library.  Especially for newbies (I can only imagine, at 
> this stage) it would make working with files much easier in a many ways.
> 
> "Easier" or "more difficult" is a subjective thing, of course, but one 
> can't argue with the fact that path can sometimes do through a single 
> object what would otherwise require several imports and a bunch of calls 
> into things like open(), os.path, grep, and shutil.

Correct.

> Examples showing effective uses of path that simplify those cases would 
> probably merit the label "easier" even in Guido's mind, though 
> unfortunately that's not certain.  "Easier" in some minds might simply 
> translate to "many lines less code", and while path can sometimes do 
> that, aside from the ease of splitting and joining stuff without 
> multiple calls to os.path.this-and-that, it really doesn't often reduce 
> code size _that_ much, in my experience.  (Postings to c.l.p showing a 
> 50% reduction in code size for contrived examples notwithstanding.)

Well, these examples are the ones we'd like to see here. So, people:
If you posted examples to c.l.py in the past, please try to collect
them here!

> A related thoughts: since paths are objects, they have attributes or 
> properties, and having things like ".basename" and ".parent" readily 
> available without having to do obscure things like 
> os.path.split(somepath)[0] makes things much easier to read (therefore 
> more maintainable).  In fact, I'd propose that as another strong 
> argument in path's favour: it makes code much more readable, even if not 
> "easier" to write.
> 
> Hmm... does "easier" or "more difficult" apply to the writing of the 
> code or the reading of it?  I find it self-evident that code written 
> using "path" is much easier to read, not necessarily much easier to 
> write (for non-newbies).

And it is much more "Pythonic" in my eyes. Though that word may be inaccurate
when it comes from someone else that Guido, I feel that endless chains of
'[os.path.join(os.path.join(z, "a"), x) for x in 
os.path.listdir(os.path.join(z, "a") if os.path.isfile(os.path.join(
are not qualified as being Pythonic.

> I'd summarize this by saying that the integration of "path" in the 
> stdlib would make it easier for newbies to write code (that might not be 
> obvious to a non-newbie... shall we ask some to help?), and easier for 
> everyone to read code (self-evident, no?), and if that's not a 
> sufficient condition for inclusion I don't know what is.

Reinhold
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Re: Buffering problem using subprocess module

[Dr. Who]

Unfortunatley that doesn't help.  Even when callee is started using the
-u, I get the same behavior.

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Re: print pdf file to network printer using python

[scrimp]

I just tried it and all that printed out was garbage. I found another
way to do it. It all depends on what you wanna do. If u want to print
to the default printer (easiest way) then just use this line:

win32api.ShellExecute(0, "print", file_path, None, ".", 0)

file_path of course being the full path of the file

Now, if u wanna print to another printer then u have to add a line:

win32print.SetDefaultPrinter(printer_name)
win32api.ShellExecute(0, "print", file_path, None, ".", 0)

printer_name being the NAME of the printer that is installed on the
machine not the path of the printer

Everything works good and the PDF file comes out perfect. The only
problem I have is that ShellExecute command starts up a blank session
of Acrobat Reader. I need that Acrobat to be terminated. I think by
using ShellExecute it does not provide the correct handle that python
needs to terminate the process. Any suggestions?

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Re: PEP on path module for standard library

[Terry Reedy]

"Reinhold Birkenfeld" <[EMAIL PROTECTED]> wrote in 
message news:[EMAIL PROTECTED]
> Most prominent change is that it doesn't inherit from str/unicode 
> anymore.
> I found this distinction important, because as a str subclass the Path 
> object
> has many methods that don't make sense for it.

While I am - on adding more to learn, I am + on collecting scattered 
filesystem functions into methods of coherent classes for eventually 
replacement of the former.  And I understand that this will mean a period 
of duplication.  But it is important to get the replacement right.

My only knowledge of the path module is what has been posted.  However, it 
seems to me that a path is conceptually a sequence of strings, rather than 
the single joined-string representation thereof.  If so, then of course it 
is not and should not be a subclass of single strings.  But that Path was 
so defined makes me wonder, in my ignorance, whether the current 
implementation is the best we can do for the future.

One advantage, for instance, of a split-up list implementation is that a 
set of paths with a common prefix could be represented by replacing the 
last string with a set of strings.

A more OO-friendly OS than the dominant ones today would accept a path as a 
list (sequence) instead of requiring that the list be joined (by an 
artifactual character) just to be split back into a list again.

My thoughts anyway.

Terry J. Reedy



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Python Programming Patterns

[Tin]

Hi,

I have listed Python Programming Patterns ISBN:0130409561 on ebay.co.uk
A brand new with really cheap price-4.99

If you are interested, go and have a look at
www.ebay.co.uk and locate that one.
Come one, fish and chips would cost more than that. Surely.

Cheers
Tin



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Re: is this pythonic?

[Terry Reedy]

"Steven D'Aprano" <[EMAIL PROTECTED]> wrote in message 
news:[EMAIL PROTECTED]
> On Thu, 21 Jul 2005 10:27:24 -0400, Bill Mill wrote:
>
> [snip]
>
>> I said the *builtins* section. I think you learn pretty quick that
>> figuring out what functions are builtins is pretty important in every
>> language. There's a fair number of people out there giving the advice
>> to read chapter 2 of the library reference cover-to-cover for a good
>> starter on python.

Including me.
>
> Sure. But for a beginner to start learning the language by reading the
> language manual is a bit much to ask.

Sure, but who is suggesting that.  Suggesting that people specifically read 
chapter 2 of the Library manual (but only that to start -- I probably have 
still not read every chapter yet) is quite different.

> There is no need to get defensive, I was merely commenting on the need to
> understand that inexperienced programmers often don't know enough about
> the language to know where to start looking for the answer.

Which is precise why I try to help by telling them where to start.  A large 
number of beginner queries posted here are answered in the builtins 
chapter.

Terry J. Reedy



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Re: Hash functions

[Cyril Bazin]

Maybe in certain case you could use hash to compare objects (hashable
of course) quicker by comparing there hash values, if the hash values
are the same you test the equality between the objects. 

But the sets and dicts cover the greatest part of the use of hash.
(Personally, I never used that explicitly in my programs)

Cyril

On 7/21/05, Michael Hudson <[EMAIL PROTECTED]> wrote:
Steven D'Aprano <[EMAIL PROTECTED]> writes:> Do people often use hash() on built-in types?Only implicitly.> What do you find it useful for?
Dictionaries :)> How about on custom classes?Same here.> Can anyone give me some good tips or hints for writing and using> hash functions in Python?Well, the usual tip for writing them is, don't, unless you need to.
If implement __eq__, then you need to, so it's fairly common to justhash a tuple containing the things that are considered by the __eq__method.  Something like:class C(object):def __init__(self, a, b, c):
self.a = aself.b = bself.c = cdef __eq__(self, other):return self.a == other.a and self.b == other.bdef __hash__(self):return hash((self.a, self.b
))Cheers,mwh--  I'm a keen cyclist and I stop at red lights.  Those who don't need  hitting with a great big slapping machine.  
-- Colin Davidson, cam.misc--http://mail.python.org/mailman/listinfo/python-list
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Re: Difference between " and '

[muldoon]

[EMAIL PROTECTED] wrote:
> Hi,
>
> Can someone tell me the difference between single quote and double
> quote?
>
> Thanks

   And please settle the dispute between "xxx". And "xxx".

   There was a fellow at Oxford who decided these things but I hear he
went mad.

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Re: PEP on path module for standard library

[Michael Hoffman]

[EMAIL PROTECTED] wrote:
> I really love Jason's 'path' module.  Sadly, I've encountered a serious
> problem with using it.  When you try to 'freeze' an application module,
> and Jason's 'path' module is present in any of the directories that are
> looked at by freeze's module finder (your app doesn't have to import
> it), freeze goes into an infinite loop of imports, eventually getting a
> 'maximum recursion depth' exception.  This seems to be related to
> freeze getting confused between 'os.path' and Jason's 'path'.
> 
> I encountered this using Jason's latest 'path' module and Python 2.3.2.
>  I was able to solve it for my use by renaming path.py to newpath.py
> and using 'from newpath import path' in my modules.
> 
> I've just notified Jason about this.  I presume a solution like mine
> will be used, and look forward to seeing Jason's module in stdlib.

This sounds like a bug in "freeze" rather than something that should be 
worked around in the standard library. Although there have already been 
people opposed to naming it path because the duplication with os.path 
might confuse humans.
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