[Pytest-commit] Issue #576: Random test failures on windows after editing a python file (hpk42/pytest)

[pombredanne]

New issue 576: Random test failures on windows after editing a python file
https://bitbucket.org/hpk42/pytest/issue/576/random-test-failures-on-windows-after

pombredanne:

I get random failures on windows only (not on mac and not on linux) with win7 and Python 2.7.8 and py.test 2.6.1.

This heisenbug occurs some times after editing a file and running py.test.
Somehow, I found that the previous version of the code was executed, not the one saved.
Clearing the __pycache__ solved the issue each time.

I reckon that I could disable bytecode creation (as per #200 ) 
However why should I need to worry about a special python flag or env var just for py.test?

Note: the issue could be due to poor filesystem timestamps resolution on windows when files are updated.

Could it make sense to have a flag disable caching? or only enable caching with a command flag?