fix: accept raw UUID strings as --namespace argument in uuid CLI by Jah-yee · Pull Request #148934 · python/cpython

Jah-yee · 2026-04-23T20:56:39Z

Good day

The python -m uuid CLI previously rejected raw UUID strings for the --namespace argument, only accepting the four predefined namespace names (@dns, @url, @oid, @x500). The existing code path at line 987 that calls UUID(namespace) as a fallback was never reached because argparse rejected the value upfront.

Root cause

The -n/--namespace argument used choices=["any UUID", *namespaces.keys()], which means argparse validated against the literal string "any UUID" rather than accepting any arbitrary UUID value.

Fix

Replaced the choices restriction with a custom type function that:

Accepts predefined namespace names (e.g. @dns) directly
Attempts to parse the input as a UUID — if valid, passes it through unchanged
Raises ArgumentTypeError for invalid strings

Example

Before:

$ python -m uuid --uuid uuid5 --namespace 0d6a16cc-34a7-47d8-b660-214d0ae184d2 --name user
error: argument -n/--namespace: invalid choice: '0d6a16cc-...' (choose from ...)

After:

$ python -m uuid --uuid uuid5 --namespace 0d6a16cc-34a7-47d8-b660-214d0ae184d2 --name user
a32f4562-2058-5b20-8055-5f38b28285b6

Fixes #148740

Thank you for your work on this project. I hope this small fix is helpful. Please let me know if there's anything to adjust.

Warmly,
RoomWithOutRoof

📚 Documentation preview 📚: https://cpython-previews--148934.org.readthedocs.build/

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fix: accept raw UUID strings as --namespace argument in uuid CLI

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fix: accept raw UUID strings as --namespace argument in uuid CLI#148934

fix: accept raw UUID strings as --namespace argument in uuid CLI#148934
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