docs: def has_parent_gradebooks(self, gradebook_id):
          """Tests if the ``Gradebook`` has any parents.
  
          arg:    gradebook_id (osid.id.Id): the ``Id`` of a gradebook
          return: (boolean) - ``true`` if the gradebook has parents,
                  ``false`` otherwise
          raise:  NotFound - ``gradebook_id`` is not found
          raise:  NullArgument - ``gradebook_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.BinHierarchySession.has_parent_bins
          if self._catalog_session is not None:
              return self._catalog_session.has_parent_catalogs(catalog_id=gradebook_id)
          return self._hierarchy_session.has_parents(id_=gradebook_id)