python重载运算符

class Time60(object):    'Time60 - trace hours and minutes'    def __init__(self,h,m):        'constructor - takes hours and minutes'        self.h=h        self.m=m    def __str__(self):        'string representation'        return "%02d:%02d" % (self.h,self.m)    __repe__=__str__    def __add__(self,other):        'overloading the addition operator'        m=self.m+other.m        h=(self.h+other.h+m//60)        return self.__class__(h,m%60)    def __iadd__(self,other):        'overloading in-place addition'        m=self.m+other.m        h=(self.h+other.h+m//60)        self.m=m%60        self.h=h;        return selffrom random import choiceclass RandSeq(object):    def __init__(self,seq):        self.data=seq    def __iter__(self):        return self    def __next__(self):        return choice(self.data)x=Time60(12,5)print(x)a=RandSeq([1,2,34,45,7,9,5,3,7])it=iter(a)for x in range(5):    print(it.__next__())