[docs] [issue16863] Argparse tutorial outdated

[Ezio Melotti]

Ezio Melotti added the comment:

When I backported the patch I probably didn't want to try all the examples to see what the py2 error was.  In addition the py3 error is more clear even if it doesn't match what you actually get.
I think this can be closed as won't fix, unless someone wants to propose a patch.

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type:  -> enhancement

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