[issue9213] range purports to implement the Sequence ABC, but is missing index and count methods

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +gvanrossum, mark.dickinson, rhettinger
stage: unit test needed -> patch review
versions:  -Python 2.6, Python 2.7, Python 3.1

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<http://bugs.python.org/issue9213>
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