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

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

Since you are requesting adding a method to an existing data type, you should probably raise this issue first on the python-ideas mailing list and be prepared to justify use cases for it.

http://mail.python.org/mailman/listinfo/python-ideas

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nosy: +ned.deily, rhettinger, stutzbach
versions: +Python 3.2

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<http://bugs.python.org/issue10059>
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