python 定时器使用

#!/usr/bin/python
# -*- coding:utf-8 -*-

import datetime,os,platform,time


def run_Task():
    import SendMail
    SendMail.SendMail()
    #os_platform=platform.platform()
    ##if os_platform.startswith("Darwin"):
        #print "this is mac os system!"
        #os.system("ls")
    #elif os_platform.startswith("Linux"):
        #print "this is Linux system!"
        #os.system("ls")

def timerFun(sched_Timer):
    flag = 0
    #now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    while True:
        now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
        #print now,sched_Timer
        if now == str(sched_Timer):
            print "*"*30
            run_Task()
            flag = 1
            time.sleep(60)
            #break
        else:
            if flag==1:
                sched_Timer=sched_Timer+datetime.timedelta(days=1)
                flag=0

if __name__ =="__main__":
    sched_Timer = datetime.datetime(2018,5,8,9,0,0)
    print "run the timer task at{0}".format(sched_Timer)
    timerFun(sched_Timer)