input: Write a function in Python to print out an array backwards. The function should iterate through the array from the last element to the first element and print each element.
  
  ### Input:
  def print_reverse_array(arr):
      for i in range(len(arr)-1, -1, -1): 
          print(arr[i])
  
  ### Output:
  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):
      for i in range(len(arr)-1, -1, -1): 
          print(arr[i])