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Stop supporting isinstance().
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The big exception is isinstance(f, Callable), which is now equivalent
to isinstance(f, collections.abc.Callable).  Also other enhanced ABCs
that shadow ABCs from collections.abc still support isinstance() --
but not the concrete classes (List, Dict, Set, FrozenSet).

I'm sad to see the original Callable.__instancecheck__ go, but Mark
Shannon's right that isinstance() with a type argument is just poorly
defined.

Fixes #135.
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Guido van Rossum committed Jun 4, 2015
1 parent 108609f commit ac7494f
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