[docs] [issue9938] Add optional keyword argument exit_on_error to argparse.ArgumentParser

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

Stéphane, thanks for your good comment. Some argparse's bpo is too old ;)

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