如何创建一个哑头双循环链表python？

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

class DummyHeadDoubleLinkedList:
    def __init__(self):
        self.dummy_head = Node()  # 哑头节点
        self.dummy_head.prev = self.dummy_head
        self.dummy_head.next = self.dummy_head

    def is_empty(self):
        return self.dummy_head.next == self.dummy_head

    def add_node(self, data):
        new_node = Node(data)
        new_node.prev = self.dummy_head
        new_node.next = self.dummy_head.next
        self.dummy_head.next.prev = new_node
        self.dummy_head.next = new_node

    def remove_node(self, data):
        current = self.dummy_head.next
        while current != self.dummy_head:
            if current.data == data:
                current.prev.next = current.next
                current.next.prev = current.prev
                return
            current = current.next

    def print_list(self):
        current = self.dummy_head.next
        while current != self.dummy_head:
            print(current.data, end=" ")
            current = current.next
        print()

# 创建一个哑头双循环链表
dll = DummyHeadDoubleLinkedList()
dll.add_node(1)
dll.add_node(2)
dll.add_node(3)

# 打印链表
dll.print_list()  # 输出: 1 2 3

# 删除节点
dll.remove_node(2)

# 打印链表
dll.print_list()  # 输出: 1 3