python定时程序（每隔一段时间执行指定函数）

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import osimport timedef print_ts(message):    print "[%s] %s"%(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()), message)def run(interval, command):    print_ts("-"*100)    print_ts("Command %s"%command)    print_ts("Starting every %s seconds."%interval)    print_ts("-"*100)    while True:        try:            # sleep for the remaining seconds of interval            time_remaining = interval-time.time()%interval            print_ts("Sleeping until %s (%s seconds)..."%((time.ctime(time.time()+time_remaining)), time_remaining))            time.sleep(time_remaining)            print_ts("Starting command.")            # execute the command            status = os.system(command)            print_ts("-"*100)            print_ts("Command status = %s."%status)        except Exception, e:            print eif __name__=="__main__":    interval = 5    command = r"ls"    run(interval, command)

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