code: def get_repository_lookup_session(self):
          
          if not self.supports_repository_lookup():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.RepositoryLookupSession(runtime=self._runtime)
docs: Gets the repository lookup session.
  
          return: (osid.repository.RepositoryLookupSession) - a
                  ``RepositoryLookupSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_repository_lookup()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_repository_lookup()`` is ``true``.*