input: Write a function to print out an array backwards. If the array is empty, print "Array is empty".
  def print_reverse_array(arr):
   if len(arr) == 0:
     print("Array is empty")
   else:
     for i in range(len(arr)-1, -1, -1): 
       print(arr[i])
  
  ### Assertions:
  assert print_reverse_array([1, 2, 3])==None  # Output should be 3, 2, 1 (printed)
  assert print_reverse_array(["a", "b", "c"])==None  # Output should be c, b, a (printed)
  assert print_reverse_array([])==None  # Output should be "Array is empty" (printed)
output: def print_reverse_array(arr):
   if len(arr) == 0:
     print("Array is empty")
   else:
     for i in range(len(arr)-1, -1, -1): 
       print(arr[i])