Circle Linked List

class Node:
    def __init__(self, item=None, link=None):
        self.item = item
        self.link = link

class CircleLinkedList:
    def __init__(self):
        self.root = None
    
    def append(self, item):
        curNode = self.root
        newNode = Node(item)
        if self.root is None:
            self.root = newNode
            newNode.link = self.root 
        else:
            while curNode.link is not self.root:  
                curNode = curNode.link
            curNode.link = newNode
            newNode.link = self.root