[issue7301] Add environment variable $PYTHONWARNINGS

[Brian Curtin]

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

I attached a patch against trunk r76237 which seems to cover this, sans
official tests. I looked around and didn't find a good place for
specifically testing environment variables. I could add test code in
test_warnings if that's the best place.

The patch allows multiple warnings to be passed to the environment
variable as a comma separated string, and works in conjunction with -W.

Let me know what you think.

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keywords: +patch
nosy: +brian.curtin
Added file: http://bugs.python.org/file15322/issue7301.patch

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