[docs] [issue16863] Python 2 error in Argparse tutorial

[Roundup Robot]

Roundup Robot added the comment:

New changeset e7428d7f641f by Terry Jan Reedy in branch '2.7':
Issue #16863: Explain difference between text and 2.7 behavior.
https://hg.python.org/cpython/rev/e7428d7f641f

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nosy: +python-dev

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<http://bugs.python.org/issue16863>
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