[issue41409] deque.pop(index) is not supported

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

deque is not a subclass of MutableMapping, so the Liskov substitution principle is not related here.

deque is not registered as a virtual subclass of MutableMapping and it lacks a number of MutableMapping methods.

>>> import collections.abc
>>> issubclass(collections.deque, collections.abc.MutableMapping)
False
>>> sorted(set(dir(collections.abc.MutableMapping)) - set(dir(collections.deque)))
['_MutableMapping__marker', '__abstractmethods__', '__module__', '__slots__', '_abc_impl', 'get', 'items', 'keys', 'popitem', 'setdefault', 'update', 'values']

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41409>
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