[issue21740] doctest doesn't allow duck-typing callables

[Raymond Hettinger]

Raymond Hettinger added the comment:

> I'm not sure, because it would also select classes. 

Is there any reason to preclude classes?  They could reasonably have docstrings that contain doctests.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21740>
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