时钟实例

class Clock():
    def __init__(self,hour,minute,sec):
        self.condition(hour,minute,sec)

    def condition(self,hour,minute,sec):
        if type(hour) == int and hour >0 and hour<24:
            self.hour = hour
        else:
            raise TypeError('invalid hour input')
        if type(minute) == int and minute >0 and minute<60:
            self.minute = minute
        else:
            raise TypeError('invalid minute input')
        if type(sec) == int and sec >0 and sec<60:
            self.sec = sec
        else:
            raise TypeError('invalid sec input')

    def tick(self):
        if self.sec == 59:
            self.sec = 0
            if self.minute == 59:
                self.minute = 0
                if self.hour == 23:
                    self.hour = 0
                else:
                    self.hour += 1
            else:
                self.minute += 1
        else:
            self.sec += 1
        # print 'hour: %s minute: %s sec %s ' % (self.hour,self.minute,self.sec)

    def __str__(self):
        return "%2d:%2d:%2d"%(self.hour,self.minute,self.sec)

c = Clock(25,59,59)
for i in range(70):
    c.tick()
    print c