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[pycodestyle] Make E731 fix unsafe instead of display-only for class assignments (#19700)

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## Summary

Fixes #19650

---------

Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>
This commit is contained in:
Dan Parizher 2025-08-15 15:09:55 -04:00 • committed by GitHub
parent 26d6c3831f
commit 2dc2f68b0f
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GPG key ID: B5690EEEBB952194
2 changed files with 21 additions and 26 deletions
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35
crates/ruff_linter/src/rules/pycodestyle/rules/lambda_assignment.rs
View file

@ -10,7 +10,7 @@ use ruff_source_file::UniversalNewlines;
use ruff_text_size::{Ranged, TextRange}; use ruff_text_size::{Ranged, TextRange};
use crate::checkers::ast::Checker; use crate::checkers::ast::Checker;
use crate::{Edit, Fix, FixAvailability, Violation}; use crate::{Applicability, Edit, Fix, FixAvailability, Violation};
/// ## What it does /// ## What it does
/// Checks for lambda expressions which are assigned to a variable. /// Checks for lambda expressions which are assigned to a variable.
@ -105,29 +105,24 @@ pub(crate) fn lambda_assignment(
} }
} }
// Otherwise, if the assignment is in a class body, flag it, but use a display-only fix. // If the lambda is shadowing a variable in the current scope,
// Rewriting safely would require making this a static method.
//
// Similarly, if the lambda is shadowing a variable in the current scope,
// rewriting it as a function declaration may break type-checking. // rewriting it as a function declaration may break type-checking.
// See: https://github.com/astral-sh/ruff/issues/5421 // See: https://github.com/astral-sh/ruff/issues/5421
if checker.semantic().current_scope().kind.is_class() let applicability = if checker
|| checker .semantic()
.semantic() .current_scope()
.current_scope() .get_all(id)
.get_all(id) .any(|binding_id| checker.semantic().binding(binding_id).kind.is_annotation())
.any(|binding_id| checker.semantic().binding(binding_id).kind.is_annotation())
{ {
diagnostic.set_fix(Fix::display_only_edit(Edit::range_replacement( Applicability::DisplayOnly
indented,
stmt.range(),
)));
} else { } else {
diagnostic.set_fix(Fix::unsafe_edit(Edit::range_replacement( Applicability::Unsafe
indented, };
stmt.range(),
))); diagnostic.set_fix(Fix::applicable_edit(
} Edit::range_replacement(indented, stmt.range()),
applicability,
));
} }
} }

12
crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E731_E731.py.snap
View file

@ -105,7 +105,7 @@ help: Rewrite `f` as a `def`
26 27 | 26 27 |
27 28 | def scope(): 27 28 | def scope():
E731 Do not assign a `lambda` expression, use a `def` E731 [*] Do not assign a `lambda` expression, use a `def`
--> E731.py:57:5 --> E731.py:57:5
| |
55 | class Scope: 55 | class Scope:
@ -115,7 +115,7 @@ E731 Do not assign a `lambda` expression, use a `def`
| |
help: Rewrite `f` as a `def` help: Rewrite `f` as a `def`
ℹ Display-only fix ℹ Unsafe fix
54 54 | 54 54 |
55 55 | class Scope: 55 55 | class Scope:
56 56 | # E731 56 56 | # E731
@ -318,7 +318,7 @@ help: Rewrite `f` as a `def`
137 138 | 137 138 |
138 139 | class TemperatureScales(Enum): 138 139 | class TemperatureScales(Enum):
E731 Do not assign a `lambda` expression, use a `def` E731 [*] Do not assign a `lambda` expression, use a `def`
--> E731.py:139:5 --> E731.py:139:5
| |
138 | class TemperatureScales(Enum): 138 | class TemperatureScales(Enum):
@ -328,7 +328,7 @@ E731 Do not assign a `lambda` expression, use a `def`
| |
help: Rewrite `CELSIUS` as a `def` help: Rewrite `CELSIUS` as a `def`
ℹ Display-only fix ℹ Unsafe fix
136 136 | 136 136 |
137 137 | 137 137 |
138 138 | class TemperatureScales(Enum): 138 138 | class TemperatureScales(Enum):
@ -339,7 +339,7 @@ help: Rewrite `CELSIUS` as a `def`
141 142 | 141 142 |
142 143 | 142 143 |
E731 Do not assign a `lambda` expression, use a `def` E731 [*] Do not assign a `lambda` expression, use a `def`
--> E731.py:140:5 --> E731.py:140:5
| |
138 | class TemperatureScales(Enum): 138 | class TemperatureScales(Enum):
@ -349,7 +349,7 @@ E731 Do not assign a `lambda` expression, use a `def`
| |
help: Rewrite `FAHRENHEIT` as a `def` help: Rewrite `FAHRENHEIT` as a `def`
ℹ Display-only fix ℹ Unsafe fix
137 137 | 137 137 |
138 138 | class TemperatureScales(Enum): 138 138 | class TemperatureScales(Enum):
139 139 | CELSIUS = (lambda deg_c: deg_c) 139 139 | CELSIUS = (lambda deg_c: deg_c)