Python入门学习笔记（ 魔法方法 简单定制）

https://fishc.com.cn/forum.php?mod=viewthread&tid=51326&extra=page%3D1%26filter%3Dtypeid%26typeid%3D403

import time as t

class Mytimer():
    def __init__(self):
        self.unit = ['年','月','天','小时','分钟','秒']
        self.prompt = "未开始计时！"
        self.lasted = []
        self.begin = 0
        self.end = 0

    def __str__(self):
        return self.prompt

    __repr__=__str__


    def __add__(self,other):
        prompt = "总共运行了"
        result = []
        for index in range(6):
            result.append(self.lasted[index] + other.lasted[index])
            if result[index]:
                prompt += (str(result[index]) + self.unit[index])
            return prompt
                
    #开始计时
    def start(self):
        self.begin = t.localtime()
        self.prompt = "提示：请先调用 stop() 停止计时！"
        print("计时开始...")

    #停止计时
    def stop(self):
        if not self.begin:
            print("提示：请先调用start()进行计时！")
        else:
            self.end = t.localtime()
            self._calc()
            print("计时结束！")

    #内部方法计算运行时间
    def _calc(self):
        self.lasted = []
        self.prompt = "总共运行了"
        for index in range(6):
            self.lasted.append(self.end[index] - self.begin[index])
            if self.lasted[index]:
                self.prompt += (str(self.lasted[index]) + self.unit[index])
        #为下一轮计时初始化变量
        self.begin = 0
        self.end = 0