[docs] [issue14034] Add argparse howto

[Tshepang Lekhonkhobe]

Tshepang Lekhonkhobe <tshepang at gmail.com> added the comment:

addressing the bulk of your comments

this does not address last message, where you want the lines highlighted; it will be rather tedious; to me the code snippets are short enough, removing the need for highlighting

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Added file: http://bugs.python.org/file25409/argparse_howto4.patch

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