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Remodel class scoped name resolution #21216

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Remodel class scoped name resolution #21216

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1498e83
Remodel class scoped name resolution
Apr 13, 2026
e98f4be
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 13, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks 
for more information, see https://pre-commit.ci
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pre-commit-ci[bot] committed Apr 13, 2026
commit e98f4be03f44786f695672a58697dc11704c7f57
6 changes: 2 additions & 4 deletions mypy/semanal.py
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Expand Up @@ -2110,9 +2110,7 @@ def analyze_class_body_common(self, defn: ClassDef) -> None:
# Pre-scan class body to find names assigned at class scope level.
# This must happen after enter_class (which pushes an empty set) so we
# can replace it with the real set.
self.class_body_assigned_names[-1] = collect_class_body_assigned_names(
defn.defs.body
)
self.class_body_assigned_names[-1] = collect_class_body_assigned_names(defn.defs.body)
if any(b.self_type is not None for b in defn.info.mro):
self.setup_self_type()
defn.defs.accept(self)
Expand Down Expand Up @@ -8396,7 +8394,7 @@ def collect_class_body_assigned_names(stmts: list[Statement]) -> set[str]:
This mirrors CPython's compile-time analysis that determines whether a name
in a class body is accessed via LOAD_NAME (class dict -> globals -> builtins)
or LOAD_CLASSDEREF or LOAD_FROM_DICT_OR_DEREF (class dict -> enclosing function cell).

Names that are assigned anywhere in the class body (even inside if/for/while/try/with blocks)
use LOAD_NAME, so they should NOT be resolved from enclosing function locals.

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