code: def test_append_tensor_list(self):
      l = data_structures.new_list()
      x = constant_op.constant([1, 2, 3])
      l = data_structures.list_append(l, x)
  
      t = list_ops.tensor_list_stack(l, element_dtype=x.dtype)
      with self.cached_session() as sess:
          self.assertAllEqual(self.evaluate(t), [[1, 2, 3]])
  
imports: from tensorflow.python.autograph.operators import data_structures
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import list_ops
  from tensorflow.python.ops import tensor_array_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 9 for calling the ListTest obj's underlying member method code with example usage: obj.test_append_tensor_list() without return types