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):
        self.helper_print(self.head)

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

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

my_instance = my_linked_list()
n = int(input('How many elements you wish to add ? '))
for i in range(n):
    data = int(input('Enter a data item : '))
    my_instance.add_value(data)

print('该链表: ')
my_instance.print_it()

你想添加多少个元素？4
输入一个数据项：34
输入一个数据项：67
输入一个数据项：12
输入一个数据项：89
链表：
34
67
12
89