Stderr and Pythonw

[vm_usenet]

Hi everyone,

I've seen this subject come up in another thread, but not getting
enough attention - so I'll just ask it:
When running python code via pythonw, what exactly happens to stderr?
I tried running code that, among else, writes to stderr - and at some
point I get an IOError claiming "Bad file descriptor".

Why is this happending?

Thanks in advance,

vm

[Dennis Lee Bieber]

On 29 Jun 2004 12:25:58 -0700, vm*******@yahoo.com (vm_usenet) declaimed
the following in comp.lang.python:

When running python code via pythonw, what exactly happens to stderr?
You aren't invoking programs by typing "pythonw program.py" in a
command console window, are you?

pythonw was intended to be used for programs activated by
clicking on icons in Windows. As such, these programs are presumed to
have NO CONSOLE I/O, all I/O must be handled by the program creating a
window (GUI) or file and writing to that.

Since there is no console expected, none of the std***
connections are created.

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[Manlio Perillo]

On Wed, 30 Jun 2004 04:22:16 GMT, Dennis Lee Bieber
<wl*****@ix.netcom.com> wrote:

On 29 Jun 2004 12:25:58 -0700, vm*******@yahoo.com (vm_usenet) declaimed
the following in comp.lang.python:

When running python code via pythonw, what exactly happens to stderr?

You aren't invoking programs by typing "pythonw program.py" in a
command console window, are you?

pythonw was intended to be used for programs activated by
clicking on icons in Windows. As such, these programs are presumed to
have NO CONSOLE I/O, all I/O must be handled by the program creating a
window (GUI) or file and writing to that.

Since there is no console expected, none of the std***
connections are created.

This not really corrected.
Actually 'some' std*** connections are created but are usefulness
(and moreover they have a bug).

If you write more than 4096 an exception is raised...
Regards Manlio Perillo

[Peter Hansen]

Manlio Perillo wrote:

On Wed, 30 Jun 2004 04:22:16 GMT, Dennis Lee Bieber
<wl*****@ix.netcom.com> wrote:

On 29 Jun 2004 12:25:58 -0700, vm*******@yahoo.com (vm_usenet) declaimed
the following in comp.lang.python:

When running python code via pythonw, what exactly happens to stderr?

Since there is no console expected, none of the std***
connections are created.

This not really corrected.
Actually 'some' std*** connections are created but are usefulness
(and moreover they have a bug).

If you write more than 4096 an exception is raised...

And, for future reference, here is the bug report Manlio filed
on SourceForge (for which there is no response yet):

http://sourceforge.net/tracker/index...70&atid=105470

I've also confirmed this, using a test script very similar to one
Tim Peters posted a couple of months ago in
http://groups.google.ca/groups?selm=...t%40python.org

The problem is confirmed to still exist with Python 2.3.4.

-Peter