[Python-ideas] Expose __abstractmethods__/__isabstractmethod__ in abc

[Nick Coghlan]

The additional module level functions sound like a good idea to me. I see
it as similar to the functools.singledispatch driven addition to expose a
way to obtain a cache validity token for the virtual object graph.

I thought "__isabstractmethod__" was already documented though, since we
rely on it to control the pass through behaviour of property and other
decorators like classmethod and staticmethod. If it isn't, that's really a
bug rather than an RFE.

Cheers,
Nick.
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