Python 使用类实现简单的计时器

class Time60(object):    'Time60 - track hours and minutes'    def __init__(self, hr, min):        'Time60 initializer - takes hours and minutes'        self.hr = hr        self.min = min    def __str__(self):        'Time60 - string representation'        return '%d:%d' % (self.hr, self.min)    __repr__ = __str__    def __add__(self, other):        'Time60 - overloading the addition operator'        return self.__class__(self.hr + other.hr, self.min + other.min)    def __iadd_(self, other):        'Time60 - overloading in-place addition'        self.hr += other.hr        self.min += other.min        return self

In [87]: thu = Time60(10, 30)In [88]: fri = Time60(8, 45)In [89]: thu + friOut[89]: 18:75