單向連結串列模組在我前面的部落格裡面

from 單向連結串列 import Linklist,Node

class Stack:
def __init__(self):
self.__stack  = Linklist()

    def push(self,node):
self.__stack.insert_after(node)

    def pop(self):
if not self.isEmpty():
lastNode = self.__stack.getTailNode()
            self.__stack.delete(lastNode)
            return 
 
lastNode.id
        return -1
def isEmpty(self):
return self.__stack.getLength() == 0
def display(self):
current = self.__stack.head
        while current:
print('我是元素{}'.format(current.data))
            current = current.next

    def clear(self):
self.__stack.head = Node


if __name__ == '__main__'
 
:
stack = Stack()
    stack.push(Node(20))
    stack.push(Node(25))
    print(stack.isEmpty())
    print(stack.pop())
    print(stack.pop())
    print(stack.isEmpty())
    print(stack.pop())