code: def test_len(self):
      self.assertEqual(py_builtins.len_([1, 2, 3]), 3)
  
imports: import unittest
  from nvidia.dali._autograph.core import converter
  from nvidia.dali._autograph.core import function_wrappers
  from nvidia.dali._autograph.operators import py_builtins
label_desc: Use image node_id 5 for calling the PyBuiltinsTest obj's underlying member method code with example usage: obj.test_len() without return types