[docs] [issue39527] Update doc of argparse.rst

Feb. 1, 2020

      New submission from hai shi <shihai1991@126.com>:

1. examples don't need import argparse much times(IMHO, it should be a default behavior);
2. argparse have no doctest, it's not a good behavior;

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assignee: docs@python
components: Documentation
messages: 361213
nosy: docs@python, mdk, rhettinger, shihai1991
priority: normal
severity: normal
status: open
title: Update doc of argparse.rst
type: enhancement
versions: Python 3.9

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue39527>
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