Add UUID version 6 and 7 to stdlib (Lib/uuid.py) once RFC 4122 becomes updated

[jgehrcke]

An update to RFC 4122 is well underway: https://datatracker.ietf.org/doc/draft-ietf-uuidrev-rfc4122bis/
The last version (as of the time of writing this) is from 16 February 2023.

Editorial work seems to be happening here: https://github.com/ietf-wg-uuidrev/rfc4122bis
High-level updates are communicated here: uuid6/uuid6-ietf-draft#122

Among others, this updated standard introduces UUID versions 6 and 7. The Internet community seems to be excited about those. I trust that it's rather uncontroversial that at least those two should be added to Python's standard library once the standard is complete. But of course we should collect opinions about that idea here.

Prior art:

• Someone submitted a patch on Nov 28, 2021 without further discussion: Add UUIDv6 and UUIDv7 draft versions #29824
• There is https://github.com/stevesimmons/uuid7, published as https://pypi.org/project/uuid7
• There is https://github.com/oittaa/uuid6-python, published as https://pypi.org/project/uuid6

[terryjreedy]

uuid.py is actively maintained, but no one has claimed it at https://devguide.python.org/core-developers/experts/.

@jgehrcke Are you in a position to submit a PR at the appropriate time?

@tiran Does your security interest include this module? You patched it last July.

[jgehrcke]

@terryjreedy I think so, and I'd love to! Maybe @orsenthil can also help me with that (hello 👋).

[sergeyprokhorenko]

I recommend using the following implementations as a basis:
JavaScript
Rust
PostgreSQL
Go language
with openssl-rand or secrets.randbits (try the benchmark) for better performance.

Segment length, bits	Field in RFC	Segment content
48	unix_ts_ms	Timestamp
4	ver	Version
1	rand_a	Counter segment initialized to zero
11	rand_a	Counter segment initialized with a pseudorandom number
2	var	Variant
30	rand_b	Counter segment initialized with a pseudorandom number
32	rand_b	UUIDv7 segment filled with a pseudorandom number

[hugovk]

For reference, see discussion at https://discuss.python.org/t/add-uuid7-in-uuid-module-in-standard-library/44390.

[nineteendo]

It has landed: https://www.rfc-editor.org/rfc/rfc9562

[hugovk]

@terryjreedy I think so, and I'd love to! Maybe @orsenthil can also help me with that (hello 👋).

@jgehrcke Hi, it's been a while, would you like to work on this for 3.14?

[hugovk]

Let's close this as a duplicate of the older #89083, which also mentions UUIDv8.