PEP 767: Address feedback & open issues#4559
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JelleZijlstra merged 11 commits intopython:mainfrom Mar 11, 2026
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Clarify that bare `ReadOnly` is not allowed, and add that to rejected ideas Specify that `type[Protocol]` does not inherit the protocol's attributes Close issue: "Extending Initialization" Bikeshed on some wording Use my real name
carljm
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Aug 28, 2025
hugovk
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Feb 24, 2026
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Where are we up to with this PR? Can we merge it? Let's do so if there's no further feedback in ~a week.
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
This reverts commit 11f4522.
"Terminology" section allow initializing read-only attributes by subclass allow `@classmethod` to initialize instance attributes allow `ReadOnly` + `Final`, though redundant
carljm
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Mar 3, 2026
Improve init rules regarding `__new__` and classmethods Address Carl's comments
carljm
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Mar 9, 2026
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This is looking pretty good to me! A few thoughts after another read-through.
Clarify that inheriting from a protocol makes it behave like a nominal class (wrt ReadOnly)
carljm
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Mar 11, 2026
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@hugovk not sure if the protocol here is for me as sponsor to just merge, or to get another once-over from a PEP editor? I'm happy for this to go in. |
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It's fine to just merge it! If you don't mind I'll read through it too though. |
JelleZijlstra
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Mar 11, 2026
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ReadOnlyis not allowed, and added that to rejected ideastype[Protocol])📚 Documentation preview 📚: https://pep-previews--4559.org.readthedocs.build/