message: preserve error regex over pylint
diff: @@ -663,8 +663,8 @@ class DataServiceOpsTest(data_service_test_base.TestBase,
  ds = self.make_distributed_dataset(
  ds, cluster_2, processing_mode="distributed_epoch")
  - with self.assertRaisesRegex(errors.UnimplementedError,
  - "Cannot create a split provider for dataset of type DataServiceDataset"):
  + error_regex = "Cannot create a split provider for dataset of type DataServiceDataset" # pylint: disable=line-too-long
  + with self.assertRaisesRegex(errors.UnimplementedError, error_regex):
  self.getDatasetOutput(ds)
  @combinations.generate(test_base.eager_only_combinations())
  @@ -682,7 +682,8 @@ class DataServiceOpsTest(data_service_test_base.TestBase,
  ds = self.make_distributed_dataset(
  ds, cluster_2, processing_mode="parallel_epochs")
  - self.assertDatasetProduces(ds, [i + 1 for i in numbers], assert_items_equal=True)
  + self.assertDatasetProduces(
  + ds, [i + 1 for i in numbers], assert_items_equal=True)
  @combinations.generate(test_base.eager_only_combinations())
  def testTwoLevelDistribute(self):
  