input: 
  def print_reverse_array(arr):
      """Print an array in reverse order.
      >>> print_reverse_array([1, 2, 3, 4, 5])
      5
      4
      3
      2
      1
      """
      for i in range(len(arr) - 1, -1, -1):
          print(arr[i])
  
output:     for i in range(len(arr) - 1, -1, -1):
          print(arr[i])