@utilities.arguments_not_none<EOL><INDENT>def get_grade_system_ids_by_gradebook(self, gradebook_id):<DEDENT>
<EOL>id_list = []<EOL>for grade_system in self.get_grade_systems_by_gradebook(gradebook_id):<EOL><INDENT>id_list.append(grade_system.get_id())<EOL><DEDENT>return IdList(id_list)<EOL>
Gets the list of ``GradeSystem``  ``Ids`` associated with a ``Gradebook``.

        arg:    gradebook_id (osid.id.Id): ``Id`` of the ``Gradebook``
        return: (osid.id.IdList) - list of related grade system ``Ids``
        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.*