I came across this trying to run mypy benchmarks. The version I had contained

classAugmentedHelpFormatter(argparse.RawDescriptionHelpFormatter):def__init__(self,prog:str)->None:super().__init__(prog=prog,max_help_position=30)

Which was rewritten in a newer version to:

classAugmentedHelpFormatter(argparse.RawDescriptionHelpFormatter):def__init__(self,prog:str,**kwargs:Any)->None:super().__init__(prog=prog,max_help_position=30,**kwargs)

The changes in#124456 and#132323 can be made without breaking user code, if they accept the new args as **kwargs, extract their values from kwargs if they are there, and continue working as before if not. Is there a good reason not to do this?

Do these changes currently comply with Python's backwards compatibility policy?

Linked PRs

• gh-133653: Fix subclassingHelpFormatter #133668
• gh-133653: Fix argparse.ArgumentParser with the formatter_class argument #133813
• [3.14] gh-133653: Fix argparse.ArgumentParser with the formatter_class argument (GH-133813) #133941