Method isa

lib/sqlalchemy/orm/mapper.py:3387–3393

Return True if the this mapper inherits from the given mapper.

(self, other: Mapper[Any])

            return _state_mapper(state) is s

    def isa(self, other: Mapper[Any]) -> bool:
        """Return True if the this mapper inherits from the given mapper."""

        m: Optional[Mapper[Any]] = self
        while m and m is not other:
            m = m.inherits
        return bool(m)

    def iterate_to_root(self) -> Iterator[Mapper[Any]]:
        m: Optional[Mapper[Any]] = self