[issue10271] warnings.showwarning should allow any callable object

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Brett's been very busy with real life.  Maybe someone else can commit this.

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nosy: +r.david.murray

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10271>
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