So how about we change callable() and add hashable(), iterable() and
whatever else makes sense so that these all become like this:
def callable(x):
return getattr(x, "__call__", None) is not None
This way classes can explicitly declare that they aren't callable,
hashable, iterable etc. by setting the corresponding attribute to
None.
--
--Guido van Rossum (home page: http://www.python.org/~guido/)
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