[issue2965] Update interface of weakref dictionaries

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

I will apply the patch to 3.0.

Please open a separate bug for the simplification (which is not an API
change).  As for returning iterators rather than views, it would be nice
to get that fixed before the final release, but I don't see that as
critical.  Please open a separate bug for that.

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nosy: +barry

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