[issue26510] [argparse] Add required argument to add_subparsers

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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assignee:  -> merwok
nosy: +merwok
stage:  -> commit review
versions: +Python 3.7 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26510>
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