单向链表python 实现

class Node:

    # 构造函数，初始化类
    def __init__(self, item):
        #定义一个数据域和指针域
        self._item = item
        self._next = None

    # 定义函数getItem(), 获取结点数据域
    def get_item(self):
        return self._item

    # 定义函数setItem(), 结点数据域赋值
    def set_item(self, item):
        self._item = item

    # 定义函数getNext(), 获取结点指针域
    def get_next(self):
        return self._next

    # 定义函数setNext(), 结点指针域赋值
    def set_next(self, node):
        self._next = node

    # 定义函数destroyNode(), 销毁结点
    def destory_node(self):
        self._item = None
        self._next = None