code: def cache_py2_modules():
      
      if len(sys.py2_modules) != 0:
          return
      assert not detect_hooks()
      import urllib
      sys.py2_modules['urllib'] = urllib
  
      import email
      sys.py2_modules['email'] = email
  
      import pickle
      sys.py2_modules['pickle'] = pickle
docs: Currently this function is unneeded, as we are not attempting to provide import hooks
      for modules with ambiguous names: email, urllib, pickle.