[issue10271] warnings.showwarning should allow any callable object

[lekma]

lekma <lekmalek at gmail.com> added the comment:

- split the patch between the actual fix and the test
- rewrote the test a little bit (I'm not sure it's even needed, hence the split)
- rediff against 3.3 (should still apply cleanly on top of 3.2 (modulo offset))

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versions: +Python 3.3
Added file: http://bugs.python.org/file21694/Issue10271.33.fix.diff

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