python 写个定时器

# /usr/bin/python
# coding:utf8
import threading
import time
import datetime


class MyTimer(threading.Thread):
    def __init__(self, name, time_range):
        super(MyTimer, self).__init__()
        self.name = name
        self.time_range = time_range
        self.daemon = True
        self.isup = False

    def set_flag(self):
        self.isup = True

    def run(self):
        start_time = time.time()
        while True:
            if (time.time() - start_time) >= 15:
                print "time range is %s,time is up" % self.time_range
                self.set_flag()
                start_time = time.time()


class MyTask(threading.Thread):
    def __init__(self, name, mytimer=None):
        super(MyTask, self).__init__()
        self.name = name
        self.exe_another = False
        self.daemon = True

    def set_flag(self):
        self.exe_another = True

    def run(self):
        while True:
            time.sleep(1)
            print "thread name: " + self.name
            if self.exe_another:
                print "exec another func"
                print "exec another func end"
                self.exe_another = False


if __name__ == '__main__':
    mytimer = MyTimer("timer1", 15)
    mytask = MyTask("task1")
    mytimer.start()
    mytask.start()
    while True:
        if mytimer.isup == True:
            mytask.set_flag()
            mytimer.isup = False