Apr 1, 2025 · Mar 31, 2025 · Mar 31, 2025 · Mar 31, 2025
diff --git a/mypy/semanal.py b/mypy/semanal.py
    def analyze_enum_assign(self, s: AssignmentStmt) -> bool:
        """Check if s defines an Enum."""
        if isinstance(s.rvalue, CallExpr) and isinstance(s.rvalue.analyzed, EnumCallExpr):
            # Already analyzed enum --nothing to do here.
            returnTrue
            # Already analyzed enum --only recheck that it can be stored correctly.
            returnlen(s.lvalues) == 1 and isinstance(s.lvalues[0], NameExpr)
        return self.enum_call_analyzer.process_enum_call(s, self.is_func_scope())

    def analyze_namedtuple_assign(self, s: AssignmentStmt) -> bool:
diff --git a/test-data/unit/check-enum.test b/test-data/unit/check-enum.test

 reveal_type(list_vals(Choices))  # N: Revealed type is "builtins.list[__main__.Choices]"
 [builtins fixtures/enum.pyi]

 [case testEnumAsClassMemberNoCrash]
 # https://github.com/python/mypy/issues/18736
 from enum import Enum

 class Base:
    def __init__(self, namespace: tuple[str, ...]) -> None:
        # Not a bug: trigger defer
        names = [name for name in namespace if fail]  # E: Name "fail" is not defined
        self.o = Enum("o", names)  # E: Enum type as attribute is not supported \
                                   # E: Second argument of Enum() must be string, tuple, list or dict literal for mypy to determine Enum members
 [builtins fixtures/tuple.pyi]
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3464,8 +3464,8 @@ def record_special_form_lvalue(self, s: AssignmentStmt) -> None:
		def analyze_enum_assign(self, s: AssignmentStmt) -> bool:
		"""Check if s defines an Enum."""
		if isinstance(s.rvalue, CallExpr) and isinstance(s.rvalue.analyzed, EnumCallExpr):
		# Already analyzed enum --nothing to do here.
		returnTrue
		# Already analyzed enum --only recheck that it can be stored correctly.
		returnlen(s.lvalues) == 1 and isinstance(s.lvalues[0], NameExpr)
		return self.enum_call_analyzer.process_enum_call(s, self.is_func_scope())

		def analyze_namedtuple_assign(self, s: AssignmentStmt) -> bool:
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2512,3 +2512,15 @@ def list_vals(e: Type[T]) -> list[T]:

		reveal_type(list_vals(Choices)) # N: Revealed type is "builtins.list[__main__.Choices]"
		[builtins fixtures/enum.pyi]

		[case testEnumAsClassMemberNoCrash]
		# https://github.com/python/mypy/issues/18736
		from enum import Enum

		class Base:
		def __init__(self, namespace: tuple[str, ...]) -> None:
		# Not a bug: trigger defer
		names = [name for name in namespace if fail] # E: Name "fail" is not defined
		self.o = Enum("o", names) # E: Enum type as attribute is not supported \
		# E: Second argument of Enum() must be string, tuple, list or dict literal for mypy to determine Enum members
		[builtins fixtures/tuple.pyi]