def get_parent_gradebook_nodes(self):
parent_gradebook_nodes = []<EOL>for node in self._my_map['<STR_LIT>']:<EOL><INDENT>parent_gradebook_nodes.append(GradebookNode(<EOL>node._my_map,<EOL>runtime=self._runtime,<EOL>proxy=self._proxy,<EOL>lookup_session=self._lookup_session))<EOL><DEDENT>return GradebookNodeList(parent_gradebook_nodes)<EOL>
Gets the parents of this gradebook.

        return: (osid.grading.GradebookNodeList) - the parents of the
                ``id``
        *compliance: mandatory -- This method must be implemented.*