class Node:
   def __init__(self, my_data):
      self.previous = None
      self.data = my_data
      self.next = None
class double_list:
   def __init__(self):
      self.head = None
      self.tail = None
      self.size = 0
   def add_data(self, my_data):
      new_node = Node(my_data)
      if(self.head == None):
         self.head = self.tail = new_node
         self.head.previous = None
         self.tail.next = None
      else:
         self.tail.next = new_node
         new_node.previous = self.tail
         self.tail = new_node
         self.tail.next = None
         self.size = self.size + 1;
   def print_it(self):
      curr = self.head
      if (self.head == None):
         print("列表是空的")
         return
      print("双向链表中的节点是：")
      while curr != None:
         print(curr.data)
         curr = curr.next
   def rotate_list(self, num):
      curr = self.head;
      if(num == 0 or num >= self.size):
         return;
      else:
         for i in range(1, num):
            curr = curr.next;
         self.tail.next = self.head;
         self.head = curr.next;
         self.head.previous = None;
         self.tail = curr;
         self.tail.next = None;
my_instance = double_list()
print("正在将元素加入双向链表")
my_instance.add_data(10)
my_instance.add_data(24)
my_instance.add_data(54)
my_instance.add_data(77)
my_instance.add_data(24)
my_instance.add_data(0)
my_instance.print_it()
print("旋转后列表中的元素： ")
my_instance.rotate_list(4)
my_instance.print_it()

正在将元素添加到双向链表
双向链表中的节点是：
10
24
54
77
24
0
旋转后列表中的元素：
双向链表中的节点是：
24
0
10
24
54
77