Method setdefault

lib/sqlalchemy/ext/mutable.py:822–824

(
            self: MutableDict[_KT, Optional[_T]], key: _KT, value: None = None
        )

        @overload
        def setdefault(
            self: MutableDict[_KT, Optional[_T]], key: _KT, value: None = None
        ) -> Optional[_T]: ...

        @overload
        def setdefault(self, key: _KT, value: _VT) -> _VT: ...