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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Ezio Melotti added the comment:
>
> Would using callable() instead of inspect.isfunction() be ok?

I'm not sure, because it would also select classes. I guess we need 
something a bit smarter.

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