Python的APScheduler模块

APScheduler：是一个任务定时执行的模块，定时调度自己的任务，比系统提供的定时服务灵活很多

可以采用两种方式添加任务，调用add_job()方法或使用scheduled_job()装饰器。

调用add_job方法：

[python] view plain copy

 print?

1. import datetime  
2. from apscheduler.schedulers.blocking import BlockingScheduler  
3.   
4. scheduler = BlockingScheduler()  
5.   
6. def test():  
7.     print "now is '%s' " % datetime.datetime.now()  
8.   
9. scheduler.add_job(test, "cron", second="*/3")  
10.   
11. try:  
12.     scheduler.start()  
13. except (KeyboardInterrupt, SystemExit):  
14.     scheduler.shutdown()  

使用装饰器：

[python] view plain copy

 print?

1. import datetime  
2. from apscheduler.schedulers.blocking import BlockingScheduler  
3.   
4. scheduler = BlockingScheduler()  
5.  
6.  
7. @scheduler.scheduled_job("cron", second="*/3")  
8. def test():  
9.     print "now is '%s' " % datetime.datetime.now()  
10.   
11. try:  
12.     scheduler.start()  
13. except (KeyboardInterrupt, SystemExit):  
14.     scheduler.shutdown(  

cron表达式说明 

Expression

Field

Description

*

any

Fire on every value

*/a

any

Fire every a values, starting from the minimum

a-b

any

Fire on any value within the a-b range (a must be smaller than b)

a-b/c

any

Fire every c values within the a-b range

xth y

day

Fire on the x -th occurrence of weekday y within the month

last x

day

Fire on the last occurrence of weekday x within the month

last

day

Fire on the last day within the month

x,y,z

any

Fire on any matching expression; can combine any number of any of the above expressions

官方文档：http://apscheduler.readthedocs.org/en/latest/index.html