[issue7301] Add environment variable $PYTHONWARNINGS

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The tests don't look good to me. You should use p.communicate() rather than p.stdout.read(). Also, check the error return code and raise an error if it's non-zero.

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nosy: +pitrou

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<http://bugs.python.org/issue7301>
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