code: def get_objective_admin_session(self):
          
          if not self.supports_objective_admin():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.ObjectiveAdminSession(runtime=self._runtime)
docs: Gets the ``OsidSession`` associated with the objective administration service.
  
          return: (osid.learning.ObjectiveAdminSession) - an
                  ``ObjectiveAdminSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_objective_admin()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_objective_admin()`` is ``true``.*