[docs] [issue9182] document “--” as a way to distinguish option w/ narg='+' from positional argument in argparse

[Sergey Konoplev]

Sergey Konoplev <gray.ru at gmail.com> added the comment:

Thank you for the hint. It is realy not so obvious.

May be it is worth to add "--" into the usage string this way

usage: [-h] [-b BAR [BAR ...]] -- foo

Otherwise it leads to misunderstanding.

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