import threading
import time
class Clock(threading.Thread):
    def __init__(self,cb):
        super(Clock, self).__init__()
        self.running = False
        self.cb=cb

    def run(self):
        self.running=True
        self.handleTime()
    def handleTime(self):
        while True:
            self.cb(time.strftime("%H:%M"))
            time.sleep(10)