docs: def get_authorization_lookup_session(self):
          """Gets the ``OsidSession`` associated with the authorization lookup service.
  
          return: (osid.authorization.AuthorizationLookupSession) - an
                  ``AuthorizationLookupSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_authorization_lookup()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_authorization_lookup()`` is ``true``.*
  
          """
          if not self.supports_authorization_lookup():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.AuthorizationLookupSession(runtime=self._runtime)