实现不带头结点的双向循环链表的创建，实现该双向循环链表上数据的排序代码

好的，我可以回答这个问题。以下是实现不带头结点的双向循环链表的创建和排序的代码：

# 定义双向循环链表节点类
class Node:
    def __init__(self, data):
        self.data = data
        self.prev = None
        self.next = None

# 定义双向循环链表类
class DoubleLinkedList:
    def __init__(self):
        self.tail = None

    # 添加节点
    def add_node(self, data):
        new_node = Node(data)
        if self.tail is None:
            self.tail = new_node
            self.tail.prev = self.tail
            self.tail.next = self.tail
        else:
            new_node.prev = self.tail
            new_node.next = self.tail.next
            self.tail.next.prev = new_node
            self.tail.next = new_node

    # 排序
    def sort(self):
        if self.tail is None:
            return
        current = self.tail.next
        while current != self.tail:
            next_node = current.next
            while next_node != self.tail.next:
                if current.data > next_node.data:
                    current.data, next_node.data = next_node.data, current.data
                next_node = next_node.next
            current = current.next

    # 打印链表
    def print_list(self):
        if self.tail is None:
            return
        current = self.tail.next
        while current != self.tail:
            print(current.data, end=' ')
            current = current.next
        print(self.tail.data)

# 测试
if __name__ == '__main__':
    dll = DoubleLinkedList()
    dll.add_node(3)
    dll.add_node(1)
    dll.add_node(4)
    dll.add_node(2)
    print('排序前：')
    dll.print_list()
    dll.sort()
    print('排序后：')
    dll.print_list()

希望这个代码能够帮到你！