multiple times subprocess fails on windows

kvbik jakub.vysoky at
Mon Nov 22 12:24:56 CET 2010

To be more specific, I have something like this in rvirtualenv itself
(that's the file):

import os
os.system("echo 128")

I generate a batch file like this (that's the pokus.bat file):

@echo off

And after that, I run the pokus.bat file from a test (that's the file):

from subprocess import Popen, PIPE
p = Popen('pokus.bat', stdout=PIPE, stderr=PIPE, shell=True)
stdout, stderr = p.communicate()
print stdout.strip()

And the problem is, that I don't receive the output of the os.system
to the PIPE. Probable there is something different on windows stdout
redirection, because similar stuff works on linux..

Thanks, Jakub.

On Nov 21, 8:39 pm, kvbik <jakub.vys... at> wrote:
> Hello,
> in a test suite in my project (called rvirtualenv [1]) I discovered a
> strange behaviour when calling from python a batch file which calles
> another python and this calles a shell command.
> [1]
> I know it sounds pretty strange, but I do this only because I am
> testing such specific tool (that has similar functionality like
> original virtualenv and there are things like activate.bat commands).
> I've uploaded some code snippet here:
> If anyone could explain me this behaviour I would be more than happy,
> because right now it is the only failing test in my project ;).
> Thanks in advance, Jakub..

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