old_contents: def f():
      id = 1
      print("in f, id={}".format(id))
  
  print("globally, id={}".format(id))
  
new_contents: def f():
      id = 1
      print("in f, id={}".format(id))
  
  f()
  print("globally, id={}".format(id))
  
subject: Add calling of f()