message: python3 fix
diff: @@ -263,7 +263,7 @@ class DatasetConstructorTest(test.TestCase):
  for i in range(3):
  results = sess.run(get_next)
  for component, result_component in zip(
  - (zip(*components[:3])[i] + expected[i]), results):
  + (list(zip(*components[:3]))[i] + expected[i]), results):
  if sparse_tensor.is_sparse(component):
  self.assertSparseValuesEqual(component, result_component)
  else:
  