[issue26604] Add optional source parameter to warnings.warn()

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3a57ced47459 by Victor Stinner in branch 'default':
Add a source parameter to warnings.warn()
https://hg.python.org/cpython/rev/3a57ced47459

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nosy: +python-dev

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<http://bugs.python.org/issue26604>
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