一个类似定时器的效果，每隔指定的秒数运行指定的函数，采用线程实现，代码简单实用。

import os
import time
 
def 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，http://www.sharejs.com
            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 e
 
if __name__=="__main__":
    interval = 5
    command = r"ipconfig"
    run(interval, command)