【说站】python创建链表的两种形式

class Node:
    def __init__(self,item):
        self.item = item
        self.next = None
 
class HandleNode:
    def create_linklist_head(self,li):
        head = Node(li[0])
        for element in li[1:]:
            node = Node(element)
            node.next = head
            head = node
        return head
 
    def create_linklist_tail(self,li):
        head = Node(li[0])
        tail = head
        for element in li[1:]:
            node = Node(element)
            tail.next = node
            tail = node
        return head
 
    def print_linklist(self,head):
        while head:
            print(head.item,end=',')
            head=head.next