code: def test_read(self):
      self.assertEqual(variables.ld(1), 1)
      o = object()
      self.assertEqual(variables.ld(o), o)
  
      self.assertIsNone(variables.ld(None))
  
file_path: tensorflow-upstream/tensorflow/python/autograph/operators/variables_test.py
imports: from tensorflow.python.autograph.operators import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the SpecialValuesTest obj's underlying member method code with example usage: obj.test_read() without return types