input: 
  def countdown(n: int) -> None:
      """ Counts down from a given positive integer to 1 and prints each number.
      >>> countdown(6)
      6
      5
      4
      3
      2
      1
      Done!
      """
      while n > 0:
          print(n)
          n -= 1
      print("Done!")
  
output:     while n > 0:
          print(n)
          n -= 1
      print("Done!")