multiple times subprocess fails on windows

[kvbik]

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] http://github.com/kvbik/rvirtualenv

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:

https://gist.github.com/709004/6ccc44d6aed5fe694bb2adbef2400bbea92998a1

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..

[kvbik]

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

import os
os.system("echo 128")

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

@echo off
pokus.py

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