python用链表实现堆栈(原创请勿转载)

单向链表模块在我前面的博客里面

from 单向链表 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())