[issue16399] argparse: append action with default list adds to list instead of overriding

[Evgeny]

Evgeny <p3gus at yandex.ru> added the comment:

You don't need action='append'. 
For desired behavior you can pass action='store' with nargs='*'.
I think it's a simplest workaround.

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nosy: +gun146

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<https://bugs.python.org/issue16399>
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