code: def test_python(self):
      def body():
          nonlocal i, s
          s = s * 10 + i
          i += 1
  
      i = 0
      s = 0
      n = 5
      control_flow.while_stmt(
          test=lambda: i < n,
          body=body,
          get_state=None,
          set_state=None,
          symbol_names=("i", "s"),
          opts={},
      )
  
      self.assertEqual(s, 1234)
  
file_path: DALI/dali/test/python/autograph/operators/test_control_flow.py
imports: import unittest
  from nvidia.dali._autograph.operators import control_flow
label_desc: Use image node_id 1 for calling the WhileLoopTest obj's underlying member method code with example usage: obj.test_python() without return types