[issue28288] Expose environment variable for Py_Py3kWarningFlag

[Berker Peksag]

Berker Peksag added the comment:

I can commit the patch this week if there are no objections to the name of the variable. I like Brett's PY3KWARNINGS suggestion, but I'm fine with either of the suggested names.

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<http://bugs.python.org/issue28288>
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