gh-89083: add support for UUID version 6 (RFC 9562)

[picnixz]

In light of the discussion in #89083, I decided to remove the previous commits on version 7 and 8 and restrict this specific PR to version 6 only. The previous post can be found in the history of this message.

For version 7, please discuss it on #121119.
For version 8, please discuss it on #123224.

• Issue: Support UUIDv6, UUIDv7, and UUIDv8 from RFC 9562 #89083

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📚 Documentation preview 📚: https://cpython-previews--120650.org.readthedocs.build/

[merwok]

I am puzzled by the PR title change – can you explain?

[picnixz]

Oh yes, after we discussed the v7 implementation, I preferred splitting the PR into 3 with one PR for each version. The ref. impl. means reference implementation but maybe I should have use the expanded wording? (I wanted to have the same title as for the v7 and not a too long title)

[merwok]

«Reference implementation» makes me think that this code is in support or a spec, and maybe not best-written or optimized for production. If this is not the case, just «implementation» or «support» like before has the right connotations 🙂

[vstinner]

LGTM

[picnixz]

Ideally, I'd like to wait for @hugovk's review as well (for both UUIDv6 and v7 as he also reviewed UUIDv8)

[picnixz]

I'll hold the merge until we decide on #130461 so that I don't have introduce conflicts in the doc branch.

EDIT: We decided to remove the .. index:: directives in uuid.rst. I'll do the same here.

[hugovk]

I'll hold the merge until we decide on #130461 so that I don't have introduce conflicts in the doc branch.

EDIT: We decided to remove the .. index:: directives in uuid.rst. I'll do the same here.

That issue's PR (#130526) now merged!

[picnixz]

@hugovk I'm not sure why the PR is still marked with an "unresolved review". Is it a bot issue? (maybe re-approving the PR would work?)

[hugovk]

Yeah, looks like the draft->ready transition triggers the bot to add the awaiting core review label:

And the CI check is:

Error: Label error. Requires exactly 1 of: awaiting merge. Found: type-feature, awaiting core review

https://github.com/python/cpython/actions/runs/13521458821/job/37782590646?pr=120650

I'll re-approve.

[picnixz]

I'll merge both UUIDv6 and v7 (#121119) by the end of the week, so that other core devs may have a look if they want. I'll also prepare a nice commit message. It's great we managed to land those before the last alpha. Hopefully it will stay during the beta and rc phases as well!

[picnixz]

Thank you all for the reviews and the patience!

[hugovk]

Thank you for the PRs and your patience! 🚀 :)