Antoon Pardon wrote:
> Second tryal, I hope the formatting doesn't get messed up now
>
> 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?
>>> from collections import deque
>>> from collections.abc import Sequence
>>> [name for name in set(dir(Sequence)) - set(dir(deque)) if not
name.startswith("_")]
['index']
So the index() method seems to be what is missing.
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