[issue26194] Undefined behavior for deque.insert() when len(d) == maxlen

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

But the postcondition d[i] == newitem is broken if i is negative.

>>> d = deque('ABC', maxlen=3)
>>> d.insert(-1, None)
>>> d
deque(['A', None, 'B'], maxlen=3)

I would expected ['A', 'B', None].

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resolution: fixed -> 
status: closed -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26194>
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