[issue17394] Add slicing support to collections.deque

[Josh Rosenberg]

Josh Rosenberg added the comment:

It seems odd to have a slice of a deque return a list. Are there any other examples of non-buffer protocol objects behaving like this in the standard library/built-ins? Only examples I can come up with are mmap objects and ctypes arrays (which are making raw binary data available in Python); it seems rather surprising that a Python level type like deque would slice to produce a list.

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nosy: +josh.r

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<http://bugs.python.org/issue17394>
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