CodeIQ 用問題

clock.py

# -*- coding: utf-8 -*-

import sys
import time
import datetime

class Observable():
    pass

class Tick(Observable):
    def start (self):
        while True:
            now = datetime.datetime.now()

            self.changed()
            self.notify_observers([now.hour, now.minute, now.second])

            time.sleep( 1.0 - (datetime.datetime.now().microsecond / 1000000.0) )


class TextClock():
    def update(self, time):
        sys.stdout.write( "\r%02d:%02d:%02d" % tuple(time) )
        sys.stdout.flush()

if __name__ == '__main__':
    tick = Tick()
    tick.add_observer( TextClock() )
    tick.start()