Playing around with the collections and collections.abc modules in python3.4 I stumbled upon the following: >>> from collections.abc import Sequence >>> from collections import deque >>> isinstance(list(), Sequence) True >>> isinstance(deque(), Sequence) False >>> This seems strange to me. As far as I understand, the documentation indicates there is no reason why deque shouldn't be a subclass of Sequence. Am I missing something or can this be considered a bug? -- Antoon.
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