[issue16540] Make itertools count, cycle, and repeat objects subscriptable like range.

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +rhettinger
stage:  -> needs patch
versions:  -Python 3.1, Python 3.2, Python 3.3, Python 3.5

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<http://bugs.python.org/issue16540>
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