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PEP 828: Supporting 'yield from' in asynchronous generators by ZeroIntensity · Pull Request #4854 · python/peps · GitHub

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PEP 828: Supporting 'yield from' in asynchronous generators - #4854

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ZeroIntensity merged 12 commits into
python:mainfrom
ZeroIntensity:async-yield-from
Mar 9, 2026
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PEP 828: Supporting 'yield from' in asynchronous generators#4854
ZeroIntensity merged 12 commits into
python:mainfrom
ZeroIntensity:async-yield-from

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ZeroIntensity commented Mar 8, 2026 •
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I have intentionally not assigned this a number. I'm not totally sure whether I want to pursue this proposal as it stands, and/or if I should open a DPO thread first. I'm opening this to get initial reactions/feedback and to provide some rendered PEP text if I ask someone for opinions. I will assign this a number if I decide to continue with the proposal.

Basic requirements (all PEP Types)

  • Read and followed PEP 1 & PEP 12
  • File created from the latest PEP template
  • PEP has next available number, & set in filename (pep-NNNN.rst), PR title (PEP 123: <Title of PEP>) and PEP header
  • Title clearly, accurately and concisely describes the content in 79 characters or less
  • Core dev/PEP editor listed as Author or Sponsor, and formally confirmed their approval
  • Author, Status (Draft), Type and Created headers filled out correctly
  • PEP-Delegate, Topic, Requires and Replaces headers completed if appropriate
  • Required sections included
    • Abstract (first section)
    • Copyright (last section; exact wording from template required)
  • Code is well-formatted (PEP 7/PEP 8) and is in code blocks, with the right lexer names if non-Python
  • PEP builds with no warnings, pre-commit checks pass and content displays as intended in the rendered HTML
  • Authors/sponsor added to .github/CODEOWNERS for the PEP

Standards Track requirements

  • PEP topic discussed in a suitable venue with general agreement that a PEP is appropriate
  • Suggested sections included (unless not applicable)
    • Motivation
    • Specification
    • Rationale
    • Backwards Compatibility
    • Security Implications
    • How to Teach This
    • Reference Implementation
    • Rejected Ideas
    • Open Issues
    • Acknowledgements
    • Footnotes
    • Change History
  • Python-Version set to valid (pre-beta) future Python version, if relevant
  • Any project stated in the PEP as supporting/endorsing/benefiting from the PEP formally confirmed such
  • Right before or after initial merging, PEP discussion thread created and linked to in Discussions-To and Post-History

📚 Documentation preview 📚: https://pep-previews--4854.org.readthedocs.build/pep-0828/

Rosuav commented Mar 8, 2026

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Probably worth opening a DPO thread. PEP looks good; not sure about targeting 3.15 but that can easily be changed later.

ZeroIntensity commented Mar 8, 2026

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Thread up: https://discuss.python.org/t/supporting-yield-from-in-asynchronous-generators/106430

JelleZijlstra reviewed Mar 8, 2026
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Comment thread peps/pep-9999.rst Outdated
johnslavik self-requested a review March 8, 2026 10:47

ZeroIntensity commented Mar 8, 2026 •
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The DPO thread showed some good initial reactions, and I received positive feedback from those I showed this to privately, so I've decided to continue with the proposal as it stands. I've assigned 828 as the PEP number.

ZeroIntensity changed the title PEP 9999: Supporting 'yield from' in asynchronous generators PEP 828: Supporting 'yield from' in asynchronous generators Mar 8, 2026
ZeroIntensity added the new-pep A new draft PEP submitted for initial review label Mar 8, 2026
ZeroIntensity marked this pull request as ready for review March 8, 2026 21:20
ZeroIntensity requested a review from a team as a code owner March 8, 2026 21:20
brianschubert reviewed Mar 8, 2026
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JelleZijlstra reviewed Mar 8, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Looks good except for the minor issues noted above

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8ba71e3 
Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
johnslavik approved these changes Mar 8, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

At a glance looks very good!

johnslavik reviewed Mar 8, 2026
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Comment thread peps/pep-0828.rst

ZeroIntensity commented Mar 8, 2026

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Thanks, everyone. I'm going to polish up the reference implementation a little bit more with @johnslavik, and then I'll merge this.

hugovk approved these changes Mar 9, 2026
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19cba73 
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
hugovk mentioned this pull request Mar 9, 2026
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ZeroIntensity merged commit 863542d into python:main Mar 9, 2026
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ZeroIntensity deleted the async-yield-from branch March 9, 2026 17:47
ethanfurman pushed a commit to ethanfurman/peps that referenced this pull request Oct 8, 2026
PEP 828: Supporting 'yield from' in asynchronous generators (python#4854
69f5c12 
)

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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JelleZijlstra JelleZijlstra approved these changes
hugovk hugovk approved these changes
brianschubert brianschubert left review comments
johnslavik johnslavik approved these changes

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