[issue7301] Add environment variable $PYTHONWARNINGS

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

Added a patch which includes tests in test_warnings. There are tests for
a single warning, two comma separated warnings, and one env var warning
and one command line warning at the same time.

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Added file: http://bugs.python.org/file15324/issue7301_v2.patch

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