class Node:
   def __init__(self, data):
      self.data = data
      self.next = None

class my_linked_list:
   def __init__(self):
      self.head = None
      self.last_node = None

   def add_value(self, my_data):
      if self.last_node is None:
         self.head = Node(my_data)
         self.last_node = self.head
      else:
         self.last_node.next = Node(my_data)
         self.last_node = self.last_node.next

   def reverse_display(self):
      self.helper_reverse_display(self.head)

   def helper_reverse_display(self, curr):
      if curr is None:
         return

      self.helper_reverse_display(curr.next)
      print(curr.data)

my_instance = my_linked_list()
n = int(input('你希望添加多少个元素？ '))
for i in range(n):
   data = int(input('输入数据项：'))
   my_instance.add_value(data)

print('逆向链表为： ')
my_instance.reverse_display()

你希望添加多少个元素？4
输入数据项：21
输入数据项：34
输入数据项：56
输入数据项：68
逆向链表为：
68
56
34
21