gh-149461: argparse: Implement `subnamespace` feature#149462

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jb2170 wants to merge 8 commits intopython:mainfrom

jb2170:argparse-subnamespace

Commits on May 6, 2026

argparse subnamespace: Add implementation for subnamespace as a str
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argparse subnamespace: Replace '-'s with '_'s in subnamespace destintation name
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argparse subnamespace: Add tests
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argparse subnamespace: Make 'subnamespace' explicit in signature of `_SubParsersAction.add_parser`
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argparse subnamespace: begin change from str to bool
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argparse subnamespace: Change implementation and tests from str to bool
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argparse subnamespace: Add documentation of subnamespace feature
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argparse subnamespace: Add NEWS and whatsnew sections
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