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Fix #20821: Check __qualname__ assignment type in class body #21211

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Fix #20821: Check __qualname__ assignment type in class body #21211

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cca0817
Add failing test for __qualname__ type checking (fixes #20821)
BHUVANSH855 Apr 13, 2026
cc69f3f
Fix #20821: enforce __qualname__ must be str in class body
BHUVANSH855 Apr 13, 2026
74bcef9
Merge branch 'master' into fix-20821-dunder-qualname
BHUVANSH855 Apr 13, 2026
53fcb40
Update semanal.py
BHUVANSH855 Apr 13, 2026
dd5693f
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 13, 2026
e2554c2
Merge branch 'master' into fix-20821-dunder-qualname
BHUVANSH855 Apr 13, 2026
448874a
Merge branch 'master' into fix-20821-dunder-qualname
BHUVANSH855 Apr 14, 2026
a2503de
Merge branch 'master' into fix-20821-dunder-qualname
BHUVANSH855 Apr 22, 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 dd5693ffb9de06abb871ab7f40f035710c81fadd
6 changes: 1 addition & 5 deletions mypy/semanal.py
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Expand Up @@ -3325,11 +3325,7 @@ def visit_assignment_stmt(self, s: AssignmentStmt) -> None:
# This should be safe as generally semantic analyzer is idempotent.
with self.allow_unbound_tvars_set():
s.rvalue.accept(self)
if (
self.is_class_scope()
and not self.is_stub_file
and not self.is_typeshed_stub_file
):
if self.is_class_scope() and not self.is_stub_file and not self.is_typeshed_stub_file:
for lvalue in s.lvalues:
if isinstance(lvalue, NameExpr) and lvalue.name == "__qualname__":
if not isinstance(s.rvalue, StrExpr):
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