input: def printArrayReverse(arr): 
      """Print elements of a python array from the end to the beginning.
      >>> printArrayReverse([1, 2, 3, 4, 5])
      5 4 3 2 1 
      """
      for i in range(len(arr) - 1, -1, -1): 
          print(arr[i], end = " ")
output:     print()