input: Write a function in Python to print out an array backwards. If the given 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])
  assert print_reverse_array([1, 2, 3])==None
  assert print_reverse_array([4, 5, 6, 7])==None
  assert print_reverse_array([])==None
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])