def create_cluster(self, api=True, exclude=None, **kwargs):
        cluster_data = {
            'name': 'cluster-api-' + str(randint(0, 1000000)),
        }
        editable_attributes = kwargs.pop('editable_attributes', None)
        vmware_attributes = kwargs.pop('vmware_attributes', None)

        if kwargs:
            cluster_data.update(kwargs)

        if 'release_id' is not cluster_data:
            cluster_data['release_id'] = self.create_release(api=False).id

        if exclude and isinstance(exclude, list):
            for ex in exclude:
                try:
                    del cluster_data[ex]
                except KeyError as err:
                    logger.warning(err)
        if api:
            resp = self.app.post(
                reverse('ClusterCollectionHandler'),
                jsonutils.dumps(cluster_data),
                headers=self.default_headers,
                expect_errors=True
            )
            self.tester.assertEqual(resp.status_code, 201, resp.body)
            cluster = resp.json_body
            cluster_db = Cluster.get_by_uid(cluster['id'])
        else:
            cluster = Cluster.create(cluster_data)
            cluster_db = cluster
            db().commit()
        self.clusters.append(cluster_db)

        if editable_attributes:
            Cluster.patch_attributes(cluster_db,
                                     {'editable': editable_attributes})
        if vmware_attributes:
            Cluster.update_vmware_attributes(cluster_db, vmware_attributes)
        return cluster_db
dataset/ETHPy150Open openstack/fuel-web/nailgun/nailgun/test/base.py/EnvironmentManager.create_cluster/operator `not in` -> `is not`