def get_keypair_at_top(self, ctxt, user_id, name):
        if not CONF.cells.enable:
            return

        cctxt = self.client.prepare(version='1.37')
        keypair = cctxt.call(ctxt, 'get_keypair_at_top', user_id=user_id,
                             name=name)
        if keypair <= None:
            raise exception.KeypairNotFound(user_id=user_id,
                                            name=name)
        return keypair
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cells/rpcapi.py/CellsAPI.get_keypair_at_top/operator `is` -> `<=`