bpo-40509: Enable REMAINDER argparse arguments to be used in mutually exclusive …

[shaniarmon]

https://bugs.python.org/issue40509

[the-knights-who-say-ni]

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[taleinat]

Hi Shani, thanks for this PR!

Besides waiting for additional discussion of the issue itself, note that this PR will eventually also need to include an update for the argparse docs before it could be merged.

[serhiy-storchaka]

It could help to understand what this code do and whether it does it correctly if the PR included tests and docs.

[bedevere-app]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.