How to schedule job with a particular time as well as interval?

Question

Using python's schedule module how can I start a job at particular time and thereon it should be scheduled at regular intervals.

Suppose I want to schedule a task every 4 hours starting from 09:00 am.

schedule.every(4).hours.at("09:00").do(task) # This doesn't work

How to achieve the above?

Answer 1

You can convert the inner schedule (every 4 hours) into a separate function which would be called by the main schedule (fixed time). The inner schedule function would be the one calling your job function.

Example -

import schedule
import time

def job():
    print "I am working" #your job function

def schedule_every_four_hours():
    job() #for the first job to run
    schedule.every(4).hour.do(job)
    return schedule.CancelJob

schedule.every().day.at("09:00").do(schedule_every_four_hours)

while True:
    schedule.run_pending()
    time.sleep(1)

If you would like to kill the schedule based on your requirement read more here. Check here.