[issue20457] Use partition and enumerate make getopt easier

[Ezio Melotti]

New submission from Ezio Melotti:

Thanks for the patches.
Are these parts of the code covered by tests?  If not, can you also provide tests for it?

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nosy: +ezio.melotti
stage:  -> patch review
versions: +Python 3.5 -Python 2.7, Python 3.1, Python 3.2, Python 3.3

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