[issue43160] argparse: add extend_const action

[Tony Lykke]

Tony Lykke <hi at tonylykke.com> added the comment:

Sorry, there's a typo in my last comment.

    --store --foo a
            Namespace(foo=['a', 'b', 'c'])

from the first set of examples should have been

    --store --foo c
            Namespace(foo=['a', 'b', 'c'])

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43160>
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