[issue28288] Expose environment variable for Py_Py3kWarningFlag

[Brett Cannon]

Brett Cannon added the comment:

I agree with Roy: while PYTHON_OPT might be nice long-term, I think that scopes it beyond a py3k change in Python 2.7 and into new feature territory.

As for a better name, PY3KWARNINGS is also possible and minimizes typo issues if that's what people are worried about.

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