[issue45235] argparse does not preserve namespace with subparser defaults

[Frost Ming]

Frost Ming <mianghong at gmail.com> added the comment:

Per the review comments of @jiasli, I worked out a second PR to fix this issue.

This fix has less side-effect and better backward compatibility. I will leave the two PRs open. Any feedback is welcome.

- Frost

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45235>
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