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[pyupgrade]: Deprecate non-pep604-isinstance (UP038) (#16681)

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## Summary

This PR deprecates UP038. Using PEP 604 syntax in `isinstance` and
`issubclass` calls isn't a recommended pattern (or community agreed best
practice)
and it negatively impacts performance. 

Resolves https://github.com/astral-sh/ruff/issues/7871

## Test Plan

I tested that selecting `UP038` results in a warning in no-preview mode
and an error in preview mode
This commit is contained in:
Micha Reiser 2025-03-13 08:42:14 +01:00
parent 776a401703
commit e740286bbd
2 changed files with 8 additions and 1 deletions
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2
crates/ruff_linter/src/codes.rs
View file

@ -532,7 +532,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
(Pyupgrade, "035") => (RuleGroup::Stable, rules::pyupgrade::rules::DeprecatedImport),
(Pyupgrade, "036") => (RuleGroup::Stable, rules::pyupgrade::rules::OutdatedVersionBlock),
(Pyupgrade, "037") => (RuleGroup::Stable, rules::pyupgrade::rules::QuotedAnnotation),
(Pyupgrade, "038") => (RuleGroup::Stable, rules::pyupgrade::rules::NonPEP604Isinstance),
(Pyupgrade, "038") => (RuleGroup::Deprecated, rules::pyupgrade::rules::NonPEP604Isinstance),
(Pyupgrade, "039") => (RuleGroup::Stable, rules::pyupgrade::rules::UnnecessaryClassParentheses),
(Pyupgrade, "040") => (RuleGroup::Stable, rules::pyupgrade::rules::NonPEP695TypeAlias),
(Pyupgrade, "041") => (RuleGroup::Stable, rules::pyupgrade::rules::TimeoutErrorAlias),

7
crates/ruff_linter/src/rules/pyupgrade/rules/use_pep604_isinstance.rs
View file

@ -33,6 +33,12 @@ impl CallKind {
}
}
/// ## Deprecation
/// This rule was deprecated as using [PEP 604] syntax in `isinstance` and `issubclass` calls
/// isn't recommended practice, and it incorrectly suggests that other typing syntaxes like [PEP 695]
/// would be supported by `isinstance` and `issubclass`. Using the [PEP 604] syntax
/// is also slightly slower.
///
/// ## What it does
/// Checks for uses of `isinstance` and `issubclass` that take a tuple
/// of types for comparison.
@ -64,6 +70,7 @@ impl CallKind {
/// - [Python documentation: `issubclass`](https://docs.python.org/3/library/functions.html#issubclass)
///
/// [PEP 604]: https://peps.python.org/pep-0604/
/// [PEP 695]: https://peps.python.org/pep-0695/
#[derive(ViolationMetadata)]
pub(crate) struct NonPEP604Isinstance {
kind: CallKind,