(self)
Derived widgets should override this to get corresponding backend.

        Returns
        -------
        backend: Type[Backend]
Derived widgets should override this to get corresponding backend.
Derived widgets should override this to get corresponding backend .
def get_backend(self) -> Type[Backend]:
        """
        Derived widgets should override this to get corresponding backend.

        Returns
        -------
        backend: Type[Backend]
        """
        raise NotImplementedError
def get_backend ( self ) -> Type [ Backend ] : raise NotImplementedError