STINNER Victor <victor.stin...@haypocalc.com> added the comment:

test___all__ just loads ALL modules... and it doesn't unload them. I patched 
test___all__ to unload modules: the "ResourceWarning: unclosed file ... 
'/dev/null' ..." disappears, but a new error occurs. The multiprocessing module 
registers _exit_function() in the atexit module. If this module is unloaded, 
the callback stays in atexit, but the callback will raise an error when it is 
called because all module variables were cleared (set to None)...

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10512>
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