[docs] [issue9694] argparse required arguments displayed under "optional arguments"

[Martin Panter]

Martin Panter added the comment:

Here is much larger patch in the spirit of Ryan’s, that fixes the documentation, adjusts the tests, and some of the internal comments and variable names in the source code as well. However if some changes are too controversial, I am happy to simplify it to (say) Ryan’s patch plus the minimum test fixes.

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versions: +Python 3.5
Added file: http://bugs.python.org/file37461/option-internal.patch

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