Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

>>> issubclass(collections.deque, collections.abc.MutableSequence)
True
>>> sorted(set(dir(collections.abc.MutableSequence)) - 
>>> set(dir(collections.deque)))
['__abstractmethods__', '__module__', '__slots__', '_abc_impl']

Well, it is a bug.

----------
type:  -> behavior

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41409>
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