[docs] [issue4966] Improving Lib Doc Sequence Types Section

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

One other things the branch doesn't currently sort out is the official signature of count() and index().

In 3.2, for *all* of str, bytes, bytearray, tuple, list, range, the index() method takes the optional start:stop parameters.

collections.Sequence.index(), OTOH, does not.

count() splits the field more evenly: str, bytes, bytearray accept the extra parameters, but list, tuple, range and collections.Sequence only support counting values in the whole sequence.

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