deque slicing

[Steven Bethard]

Anyone know why deques don't support slicing?

>>> from collections import deque
>>> d = deque(i**2 - i + 1 for i in range(10))
>>> d
deque([1, 1, 3, 7, 13, 21, 31, 43, 57, 73])
>>> d[:5]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: sequence index must be integer
>>> [d[i] for i in range(5)]
[1, 1, 3, 7, 13]

Is there a performance problem with supporting slicing perhaps?

Steve
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