code: def test_append_python(self):
      l = []
      self.assertEqual(data_structures.list_append(l, 1), [1])
      self.assertEqual(data_structures.list_append(l, 2), [1, 2])
  
imports: import unittest
  from nvidia.dali._autograph.operators import data_structures
label_desc: Use image node_id 1 for calling the ListTest obj's underlying member method code with example usage: obj.test_append_python() without return types