[issue2831] Adding start to enumerate()

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

If a start argument gets accepted, it should be positional, not a 
keyword-only argument.  That is a complete waste when there is just one 
argument with a straight-forward interpretation.  

Besides, METH_O is a lot faster than the alternatives.

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nosy: +rhettinger

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