_typeshed.structseq: Use Final instead of ClassVar
#6825
Merged
Conversation
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
As discussed in python#6816, for some `structseq` classes these attributes are writeable `ClassVar`s, but for other classes, they're read-only `ClassVar`s. Either way, however, it's probably a bad idea to be modifying these attributes, so it makes sense to simply annotate them with `Final` rather than `ClassVar`. Note that [PEP 591](https://www.python.org/dev/peps/pep-0591/) specifically states: > Type checkers should infer a final attribute that is initialized in a class body as being a class variable. Variables should not be annotated with both ClassVar and Final. As such, annotating these attributes as `Final[ClassVar[int]]` would be neither necessary nor possible.
|
Cc. @Akuli |
|
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
Akuli
approved these changes
Jan 5, 2022
|
There's probably a lot of other things where we aren't using |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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.
As discussed in #6816, for some
structseqclasses these attributes are writeableClassVars, but for other classes, they're read-onlyClassVars. Either way, however, it's probably a bad idea to be modifying these attributes, so it makes sense to simply annotate them withFinalrather thanClassVar.Note that PEP 591 specifically states:
As such, annotating these attributes as
Final[ClassVar[int]]would be neither necessary nor possible.