[issue19239] add inspect functions to retrieve attributes from both old dir() and overridden dir()

[Ethan Furman]

Ethan Furman added the comment:

It would certainly be nice.  We could do a dir() on the metaclass, discarding anything either not in dir(type) or not dundered, or both.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19239>
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