python 创建循环链表

可以使用类来创建循环链表，以下是一个示例代码：

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

class CircularLinkedList:
    def __init__(self):
        self.head = None

    def add_node(self, data):
        new_node = Node(data)
        if self.head is None:
            self.head = new_node
            new_node.next = self.head
        else:
            current = self.head
            while current.next != self.head:
                current = current.next
            current.next = new_node
            new_node.next = self.head

    def display(self):
        current = self.head
        if self.head is None:
            print("List is empty")
        else:
            while current.next != self.head:
                print(current.data, end=' ')
                current = current.next
            print(current.data)

clist = CircularLinkedList()
clist.add_node(1)
clist.add_node(2)
clist.add_node(3)
clist.add_node(4)
clist.display()

这段代码创建了一个循环链表，并添加了四个节点。最后，它打印出链表中的所有节点。