[issue26568] Add a new warnings.showmsg() function taking a warnings.WarningMessage object

[Roundup Robot]

Roundup Robot added the comment:

New changeset 79888b970cc4 by Victor Stinner in branch 'default':
Add _showwarnmsg() and _formatwarnmsg() to warnings
https://hg.python.org/cpython/rev/79888b970cc4

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nosy: +python-dev

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<http://bugs.python.org/issue26568>
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