Description

adqm

opened on Dec 21, 2025

Issue body actions

Proposal:

This is a tracking issue for implementing PEP 798 (Unpacking in Comprehensions).

Links to previous discussion of this feature:

• https://discuss.python.org/t/pre-pep-unpacking-in-comprehensions/96362
• https://discuss.python.org/t/pep-798-unpacking-in-comprehensions/99435

Linked PRs

• gh-143055: Implementation of PEP 798 #143056
• gh-143055: Fix crash in AST unparser when unparsing dict comprehension unpacking #145556
• gh-143055: Delegate to subiterators when unpacking in generator expressions #152550

Reacted by Bartosz Sławecki, Ilya Solin, Accurio and Denis Staritin

Activity

1. adqm

   added

   type-featureA feature request or enhancementA feature request or enhancement

   on Dec 21, 2025
2. aisk

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Dec 22, 2025
3. JelleZijlstra

   added a commit that references this issue on Jan 31, 2026

   gh-143055: Implementation of PEP 798 (#143056)

   ccbe41e
4. hugovk commented on Feb 6, 2026

   

   hugovk

   on Feb 6, 2026

   Member

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   Good work, #143056 is merged and will be in next week's 3.15 alpha 6! 🎉

   Anything else to do here, or shall we close this issue?

   Reacted by adam j hartz
5. adqm commented on Feb 7, 2026

   

   adqm

   on Feb 7, 2026

   ContributorAuthor

   More actions

   Yep, I think we're good here! The initial implementation is done, and I feel like if anything comes up with it, it'd probably be better as a new issue. I'll go ahead and close this now; thanks!

   Reacted by Hugo van Kemenade
6. adqm

   closed this as completedon Feb 7, 2026
7. hugovk commented on Feb 7, 2026

   

   hugovk

   on Feb 7, 2026

   Member

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   Sounds good! Would you like to open a PR to mark the PEP as Final? There's a checklist at https://github.com/python/peps/blob/main/.github/PULL_REQUEST_TEMPLATE/Mark%20a%20PEP%20as%20Final.md.

   Reacted by adam j hartz
8. thunder-coding

   added a commit that references this issue on Feb 15, 2026

   pythongh-143055: Implementation of PEP 798 (python#143056)

   7bfd8a4
9. hugovk

   changed the title [-]Implement PEP 798[/-] [+]Implement PEP 798 – Unpacking in Comprehensions[/+] on Feb 20, 2026
10. StanFromIreland commented on Mar 9, 2026

    

    StanFromIreland

    on Mar 9, 2026

    Member

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    Reopening for #145556, the AST unparser was not updated appropriately.
11. StanFromIreland

    reopened this on Mar 9, 2026
12. JelleZijlstra

    added a commit that references this issue on Mar 9, 2026

    gh-143055: Fix crash in AST unparser when unparsing dict comprehensio…

    255e79f
13. StanFromIreland

    closed this as completedon Mar 9, 2026
14. ljfp

    added a commit that references this issue on Apr 25, 2026

    pythongh-143055: Fix crash in AST unparser when unparsing dict compre…

    2a6a86f
15. graingert

    added 5 commits that reference this issue on Jun 29, 2026

    pythongh-143055: address review (fix throw() arity crash, doc precision)

    cd25639

    pythongh-143055: register _PyAsyncGenUnpack_Type with the C globals a…

    2fdf024

    pythongh-143055: Delegate to subiterators when unpacking in generator…

    c1e0905

    pythongh-143055: address review (fix throw() arity crash, doc precision)

    cd4bf33

    pythongh-143055: register _PyAsyncGenUnpack_Type with the C globals a…

    dee268c

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