python定时任务框架

from datetime import datetimeimport osimport timefrom apscheduler.schedulers.blocking import BlockingSchedulerfrom apscheduler.schedulers.background import BackgroundSchedulerdef tick():    print(‘tick! time is {}‘.format(datetime.now()))    with open(‘1.txt‘, ‘a‘) as f:        f.write(‘1‘)if __name__ == ‘__main__‘:    # scheduler = BlockingScheduler() # 这是最简单的调度器，阻塞，相当于守护进程    # scheduler.add_job(tick, ‘interval‘, seconds=3)  # 没3s执行一次    # scheduler.add_job(tick, ‘cron‘, hour=18, minute=37) # 每天的18：23执行一次    # scheduler.add_job(tick, ‘cron‘, minute=‘*‘, second=‘*‘) # 每秒执行一次    # scheduler.add_job(tick, ‘cron‘, second=‘*/3‘)  # 每3s执行一次    scheduler = BackgroundScheduler() # 后台运行，不阻塞， 住进程结束任务结束    scheduler.add_job(tick, ‘cron‘, second=‘*/3‘)    print(‘press ctrl+{0} to exit‘.format(‘break‘ if os.name == ‘nt‘ else ‘c ‘))    try:        scheduler.start()      except:        pass    while 1:        time.sleep(4)