[issue2690] Precompute range length and enhance range subscript support

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

I'm fine with it: as with the other changes for .count and .index, consistency with the protocols/ABCs the types are members of is not exclusively a new feature.

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status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2690>
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