[issue10518] Bring back callable()

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

I was originally surprised to find that callable() was gone. I pointed it out at Europython and got a very informative explanation from Brett. The isinstance(obj, collections.Callable) was introduced and it works well.

I'm with Ezio here. I'm -1 for callable(), +0 for iscallable() (there should be preferably one obvious way to do it and using isinstance() seems to be that way at this point).

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nosy: +brett.cannon, lukasz.langa

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