[issue28688] Warning -- warnings.filters was modified by test_warnings

[STINNER Victor]

STINNER Victor added the comment:

FYI Python 2.7 is not impacted by this bug because it seems like reimporting warnings.py twice gets a new fresh list from _warnings.filters. I don't undertand how/why.

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versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28688>
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