Python timed task Framework Apscheduler 3.0.3 Cron Example

Apscheduler is a Python timed task framework based on Quartz, which realizes all the functions of quartz and is very convenient to use. Provides tasks based on date, fixed time interval, and crontab type, and can be persisted. Based on these features, we can easily implement a Python timed task system .

Installation

The installation process is simple and can be based on PIP and source code.

Pip Install apscheduler==3.0.3

or download the source code, run the command:

Python setup.py Install

Cron Job Example

   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:  

  :  if' __main__ ':

One   :      Scheduler = Blockingscheduler ()

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

  :      print (' press ctrl+{0} to exit '. Format (' break 'if ' NT ' Else ' C '))

  :      try:

  :          Scheduler.start ()

  :      except (Keyboardinterrupt, Systemexit):

  17:          

  :  

  :  

  :  

Cron expressionType description

Expression	Field	Description
*	Any	Fire on every value
*/a	Any	Fire every a values, starting from the minimum
A-B	Any	Fire in any value within the-a-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	Any	Fire on any matching expression; Can combine any number of any of the above expressions

Python timed task Framework Apscheduler 3.0.3 Cron Example