old_contents: d = {1: 2, 3: 4}
  print(d.pop(3), d)
  print(d)
  print(d.pop(1, 42), d)
  print(d.pop(1, 42), d)
  print(d.pop(1, None), d)
  try:
      print(d.pop(1), "!!!",)
  except KeyError:
      print("Raised KeyError")
  else:
      print("Did not rise KeyError!")
  
new_contents: d = {1: 2, 3: 4}
  print(d.pop(3), d)
  print(d)
  print(d.pop(1, 42), d)
  print(d.pop(1, 42), d)
  print(d.pop(1, None), d)
  try:
      print(d.pop(1), "!!!")
  except KeyError:
      print("Raised KeyError")
  else:
      print("Did not raise KeyError!")
  
subject: Remove extra comma in call and fix grammar.