[issue7301] Add environment variable $PYTHONWARNINGS

[Philip Jenvey]

Philip Jenvey <pjenvey at underboss.org> added the comment:

Here's a patch for py3k using the same char2wchar as the argv decoder for posix, and better windows handling. Plus an additional nonascii value test. Patch is against r79980 for clarity

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Added file: http://bugs.python.org/file16810/issue7301-py3k.diff

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