[issue10518] Bring back callable()

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> > ABCs are still the exception in Python, and duck typing is still the
> rule.
> 
> Then why do we callable again?

Because the way __call__ is looked up means hasattr(x, "__call__") is
not the right answer. Otherwise there would be no point in bringing it
back at all.

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<http://bugs.python.org/issue10518>
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