[issue14149] argparse: Document how to use argument names that are not Python identifiers

[Fred L. Drake, Jr.]

Change by Fred L. Drake, Jr. <fdrake at gmail.com>:


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versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue14149>
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