[issue10059] add the method `index` to collections.deque

[Simon Liedtke]

Simon Liedtke <liedtke.simon at googlemail.com> added the comment:

I see that adding this method to a deque is useless. A list is better for this kind of operation. I just wrote it for fun and realized that it was implemented rather slow.

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resolution:  -> rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10059>
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