[docs] [issue9938] Documentation for argparse interactive use

[Andrew Berg]

Andrew Berg added the comment:

The patch doesn't work for 3.3 (I think it's just because the line numbers are different), but looking over what the patch does, it looks like parse_known_args will return a value for args if there is an unrecognized argument, which will cause parse_args to call error() (it should raise ArgumentError instead).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9938>
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