Method _from_argument

lib/sqlalchemy/sql/selectable.py:3271–3281

(
        cls, with_for_update: ForUpdateParameter
    )

    @classmethod
    def _from_argument(
        cls, with_for_update: ForUpdateParameter
    ) -> Optional[ForUpdateArg]:
        if isinstance(with_for_update, ForUpdateArg):
            return with_for_update
        elif with_for_update in (None, False):
            return None
        elif with_for_update is True:
            return ForUpdateArg()
        else:
            return ForUpdateArg(**cast("Dict[str, Any]", with_for_update))

    def __eq__(self, other: Any) -> bool:
        return (