Clarify that a TypeVarTuple default always has to be unpacked#1971
Merged
rchen152 merged 3 commits intopython:mainfrom May 13, 2025
Merged
Clarify that a TypeVarTuple default always has to be unpacked#1971rchen152 merged 3 commits intopython:mainfrom
rchen152 merged 3 commits intopython:mainfrom
Conversation
The spec says that: 1. The default of a TypeVarTuple can be another TypeVarTuple 2. TypeVarTuples are always unpacked. Together, these suggest that the default of a TypeVarTuple has to be an *unpacked* TypeVarTuple, and indeed [pyright](https://pyright-play.net/?pyrightVersion=1.1.386&code=GYJw9gtgBALgngBwJYDsDmUkQWEMoAqiApgGoCGIBArggDbEA0UAqiguQMYDWAUAQGcAjFAC8hEhSq0GACgDkgofICU-AQCYxEhGUo16xBYI3zmAE2LBy1OjFFK1ggMzaiuqQbmKBzs1EtrW3s2Dh4AbSUAXRUgA) and [mypy](https://mypy-play.net/?mypy=latest&python=3.12&gist=b6b01c533c7930e1e520765b773d1fe1) both agree. This PR makes that clear and adds a corresponding conformance test. I don't think this needs a discussion + Typing Council approval, since it's just a clarification of an existing rule, but happy to go through the full process if anyone disagrees.
Collaborator
|
I agree this is just a clarification. The new wording is clearer. |
Collaborator
Author
|
Oops, I forgot about this PR for a bit XD I'll regenerate the conformance results and merge. |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The spec says that:
Together, these suggest that the default of a TypeVarTuple has to be an unpacked TypeVarTuple, and indeed pyright and mypy both agree. This PR makes that clear and adds a corresponding conformance test.
I don't think this needs a discussion + Typing Council approval, since it's just a clarification of an existing rule, but happy to go through the full process if anyone disagrees.