I wanted to pass this one around before opening an issue on it. When running the unit test for popen via rt.bat (in PCBuild8), I received the following error:
=== BEGIN ERROR ===
C:\Documents and Settings\joe\Desktop\Development\Python\trunk\PCbuild8>rt test_popen Deleting .pyc/.pyo files ... 43 .pyc deleted, 0 .pyo deleted
C:\Documents and Settings\joe\Desktop\Development\Python\trunk\PCbuild8>win32Re lease\python.exe -E -tt ../lib/test/regrtest.py test_popen test_popen test test_popen failed -- Traceback (most recent call last): File "C:\Documents and Settings\joe\Desktop\Development\Python...
I can't reproduce this. I expect you will find it is due to the space in the filename of your Python directory, via cmd.exe's documented behaviour with quote characters. A patch that allows the test suite to work in such an environment would be welcome, but I think you might end up needing access to GetShortPathName() rather than CreateProcess().