[issue7301] Add environment variable $PYTHONWARNINGS

[Philip Jenvey]

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

The pending patch for py3k fixes the modification of the env value (trunk already has a fix for that).

That patch is also doing the conversion to wchar_t via the char2wchar function now, with that reusing a single buffer seems out of the question

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