[issue24489] cmath.polar() can raise due to pre-existing errno

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9f4b066754c3 by Antoine Pitrou in branch '2.7':
Issue #24489: ensure a previously set C errno doesn't disturb cmath.polar().
https://hg.python.org/cpython/rev/9f4b066754c3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24489>
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