Python定時任務框架APScheduler 3.0.3 Cron示例

APScheduler是基於Quartz的一個Python定時任務框架，實現了Quartz的全部功能，使用起來十分方便。提供了基於日期、固定時間間隔以及crontab類型的任務，而且能夠持久化任務。基於這些功能，咱們能夠很方便的實現一個python定時任務系統。

安裝

安裝過程很簡單，能夠基於pip和源碼。

Pip install apscheduler==3.0.3

或者下載源碼，運行命令：

Python setup.py install

cron job例子

   1:  #coding=utf-8

   2:  from apscheduler.schedulers.blocking import BlockingScheduler

   3:  from datetime import datetime

   4:  import time

   5:  import os

   6:     

   7:  def tick():

   8:      print('Tick! The time is: %s' % datetime.now())

   9:   

  10:  if __name__ == '__main__':

  11:      scheduler = BlockingScheduler()

  12:      scheduler.add_job(tick,'cron', second='*/3', hour='*')    

  13:      print('Press Ctrl+{0} to exit'.format('Break' if os.name == 'nt' else 'C'))

  14:      try:

  15:          scheduler.start()

  16:      except (KeyboardInterrupt, SystemExit):

  17:          scheduler.shutdown() 

  18:   

  19:   

  20:   

Cron表達 式說明

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