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

[Raymond Hettinger]

Raymond Hettinger added the comment:

> The iteration usually has linear complexity

The iteration abstract method depends on indexing as well:

    def __iter__(self):
        i = 0
        try:
            while True:
                v = self[i]
                yield v
                i += 1
        except IndexError:
            return

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