code: def test_for_iter_tier_two(self):
      class MyIter:
          def __init__(self, n):
              self.n = n
  
          def __iter__(self):
              return self
  
          def __next__(self):
              self.n -= 1
              if self.n < 0:
                  raise StopIteration
              return self.n
  
      def testfunc(n, m):
          x = 0
          for i in range(m):
              for j in MyIter(n):
                  x += 1000 * i + j
          return x
  
      opt = _testinternalcapi.get_uop_optimizer()
      with temporary_optimizer(opt):
          x = testfunc(10, 10)
  
      self.assertEqual(x, sum(range(10)) * 10010)
  
      ex = get_first_executor(testfunc)
      self.assertIsNotNone(ex)
      uops = {opname for opname, _, _ in ex}
      self.assertIn("_FOR_ITER_TIER_TWO", uops)
  
imports: import contextlib
  import opcode
  import textwrap
  import unittest
  import _testinternalcapi
label_desc: Use image node_id 16 for calling the TestUops obj's underlying member method code with example usage: obj.test_for_iter_tier_two() and returns: x, self, self