gh-149614 - Restore deepcopiability of argparse.ArgumentParser instances#149617
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DavidCEllis wants to merge 10 commits intopython:mainfrom
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gh-149614 - Restore deepcopiability of argparse.ArgumentParser instances#149617DavidCEllis wants to merge 10 commits intopython:mainfrom
DavidCEllis wants to merge 10 commits intopython:mainfrom
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savannahostrowski
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needs backport to 3.15
sobolevn
reviewed
May 9, 2026
an arbitrary dunder name.
…eak-argparse-copy
| def __getattr__(self, name): | ||
| # _colorize's no_color themes are just all empty strings | ||
| # by directly using empty strings the import is avoided | ||
| if name.startswith("_"): |
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Is there any reason not to check that this starts and ends with __ ?
We use this pattern elsewhere in the repo as well.
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With the creation of the
_ColorlessThemeto avoid importing_colorizeearly the new class unfortunately was returning empty strings for__deepcopy__along with other dunder methods which broke deepcopy.I've added tests for
copyanddeepcopybased on the test forpickle.Being more cautious, I've narrowed the class to only returning empty strings on attributes matching those taken from
_colorize.This does mean making sure the set remains in sync which could be more annoying to maintain, it would also be possible to just exclude anything starting with
_. I've updated the test that checks this theme to directly check they are in sync.TypeErrorwhen trying to deepcopyargparse.ArgumentParser()#149614