[issue25864] collections.abc.Mapping should include a __reversed__ that raises TypeError

[Andrew Barnert]

Andrew Barnert added the comment:

Serhiy already filed the typing.Reversible bug on the separate typehinting tracker (https://github.com/ambv/typehinting/issues/170). So, unless fixing that bug requires some changes back to collections.abc or something else in the stdlib, I think the only issue here is the original one, on Mapping.

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<http://bugs.python.org/issue25864>
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