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 print_it(self):
      curr = self.head
      while curr is not None:
         print(curr.data)
         curr = curr.next

my_instance = my_linked_list()
n = int(input('有多少个元素要添加？ '))
for i in range(n):
   data = int(input('输入数据值：'))
   my_instance.add_value(data)
print('链表是：')
my_instance.print_it()

有多少个元素要添加？ 4
输入数据值：6
输入数据值：7
输入数据值：8
输入数据值：9
链表是：
6
7
8
9