Default `suggest_on_error` to `True` in `argparse.ArgumentParser`

[HomerusJa]

Feature or enhancement

Proposal:

Change the default value of the suggest_on_error parameter in argparse.ArgumentParser from False to True.

This improves the UX of the argparse module by making helpful error suggestions the default behavior.

While this is technically a breaking change, the impact is negligible as it only affects error messages (which already indicate failure). Users who prefer the old behavior can explicitly set suggest_on_error=False.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

This feature has been suggested in a Bluesky thread, where it has been suggested by @savannahostrowski and @hugovk.

Linked PRs

• gh-140448: Default suggest_on_error to True in argparse.ArgumentParser #140450