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

[Terry J. Reedy]

Terry J. Reedy added the comment:

A quick patch would be 'This tutorial was written for argparse in Python 3. A few details are different in 2.x.' But feel free to do better.

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nosy: +terry.reedy

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