[issue40374] collections.abc docs table: Mapping missing __reversed__

Change by Raymond Hettinger : -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker ___ ___

[issue40374] collections.abc docs table: Mapping missing __reversed__

Thor Whalen added the comment: Dennis, Thanks for the (very complete) explanation. I induced to err because of the following confusing facts: ``` from collections.abc import Mapping, Sequence import sys if sys.version_info <= (2, 7): assert '__reversed__' not in dir(Mapping) elif

[issue40374] collections.abc docs table: Mapping missing __reversed__

Dennis Sweeney added the comment: > `Mapping.__reversed__` exists While ``'__reversed__' in dir(Mapping)`` is true, that unfortunately does not mean that it is a real callable method: from collections.abc import Mapping class Map(Mapping): def __getitem__(self, x):

[issue40374] collections.abc docs table: Mapping missing __reversed__

New submission from Thor Whalen : `Mapping.__reversed__` exists, but is not listed in the table: https://docs.python.org/3/library/collections.abc.html#collections-abstract-base-classes https://github.com/python/cpython/blob/master/Doc/library/collections.abc.rst -- assignee: