[issue23086] Add start and stop parameters to the Sequence.index() ABC mixin method

[Raymond Hettinger]

Raymond Hettinger added the comment:

Try something like this:

        if start < 0:
            start += len(self)
        if stop is None:
            stop = len(self)
        elif stop < 0:
            stop += len(self)
        for i in range(max(start, 0), min(stop, len(self))):
            if self[i] == value:
                return i
        raise ValueError

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<http://bugs.python.org/issue23086>
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