[issue37880] For argparse add_argument with action='store_const', const should default to None.

[Vinay Sajip]

Change by Vinay Sajip <vinay_sajip at yahoo.co.uk>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37880>
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