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

   def find_index_val(self, my_key):
      curr = self.head

      index_val = 0
      while curr:
         if curr.data == my_key:
            return index_val
         curr = curr.next
         index_val = index_val + 1
      return -1

my_instance = my_linked_list()
my_list = [67, 4, 78, 98, 32, 0, 11, 8]
for data in my_list:
   my_instance.add_value(data)
print('链表是:')
my_instance.print_it()
print()

my_key = int(input('您要搜索什么值？'))
index_val = my_instance.find_index_val(my_key)
if index_val == -1:
   print(str(my_key) + '未发现.')
else:
   print('元素在索引 ' + str(index_val) + ' 中被发现.')
n = int(input('您要添加多少元素？'))
for i in range(n):
   data = int(input('输入数据：'))
   my_instance.add_value(data)
print('链表是:')
my_instance.print_it()

链表是:
67
4
78
98
32
0
11
8
您要搜索什么值？11
元素在索引 6 中被发现.
您要添加多少元素？2
输入数据：111
输入数据：56
链表是:
67
4
78
98
32
0
11
8
111
56