input: from typing import List
  
  def print_reverse_array(arr: List[float]) -> None:
      """Prints out an array backwards.
      >>> print_reverse_array([1.0, 2.0, 3.0])
      3.0
      2.0
      1.0
      >>> print_reverse_array([5.0, 6.7, 8.9, 4.3])
      4.3
      8.9
      6.7
      5.0
      """
output:     for num in reversed(arr):
          print(num)