计时器源码

import time as t

class Mytimer:

    def __init__(self):
        self.prompt = '未开始计时'
        self.unit = ['年','月','日','时','分','秒']
        self.begin = 0
        self.end = 0
        self.list=[]#定义列表存储时间差

    def __str__(self):
        return self.prompt

    __repr__ = __str__

    def __add__(self, other):
        prompt = '共计用时'
        for index in range(6):
            if self.list[index] != 0 or other.list[index] != 0:
                prompt += str(int(self.list[index])+ int(other.list[index]))+self.unit[index]
        return prompt
        

    #开始计时
    def start(self):
        print('现在开始计时……')
        self.begin = t.localtime()
        if self.end == 0:
            self.prompt = '请先stop（）'

    #停止计时
    def stop(self):
        if self.begin == 0:
            print('请先start（）')
        else:    
            print('停止计时！')
            self.end = t.localtime()
            self._cals()

    #内部方法计算时间差
    def _cals(self):
        
        self.prompt = '总共运行了'
        for index in range(6):
            temp = self.end[index] - self.begin[index]
            if temp < 0:
                #测试高位是否有的借，没有的借的话向再高位借……
                i = 1
                while self.list[index-i]<1:
                    self.list[index-i] += self.borrow[index-i] - 1
                    self.list[index-i-1] -= 1
                    i += 1       
                self.list.append(self.borrow[index]+temp)
                self.list[index-1] -= 1
            else:
                self.list.append(temp)
        #由于高位随时会被借位，因此打印放在最后
        for index in range(6):
            if self.list[index]:
                self.prompt += str(self.list[index]) + self.unit[index]
        return self.prompt