1设计一个倒计时器
class Clock(object):
def __init__(self, h, m, s):
self.hour = h
self.minute = m
self.second = s
def run_clock(self):
if self.second == 0:
self.minute -= 1
self.second =60
if self.minute < 0 :
if self.hour != 0:
self.hour -= 1
self.minute = 59
self.second -= 1
def __str__(self):
# 显示时间
if self.hour == 0 and self.minute == 0 and self.second == 0:
return 0
return '%02d:%02d:%02d'%(self.hour,self.minute,self.second)
def main():
clock = Clock(2, 0, 2)
while True:
time.sleep(1)
if clock.__str__() == 0:
print('时间到了')
break
print(clock)
clock.run_clock()
if __name__ == '__main__':
main()
