Adding Timer on Python method [duplicate]

Question

I have a method that count changes of some domains that I monitor, I need the method to run only once a day so that it counts the changes only once a day. I can't find good implementation for timer on python. Any suggestions?

  def count_changes(self):
    stamp = datetime.now()
    upper_limit = stamp - timedelta(days=7)
    lower_limit = stamp - timedelta(days=2)

    nameservers = models.NameServer.query.all()
    nameservers = [item.name for item in nameservers]
    domains = models.Domain.query.all()
    domains = [item.name for item in domains]
    changes = []
    upper_limit_changes = []
    lower_limit_changes = []

    for ns in nameservers:

        for domain in domains:
            scans = models.Scan.query.filter_by(nameserver=ns, 
            domain=domain).all()
            upper_limit_changes.extend(self.get_changes(scans, upper_limit))
            lower_limit_changes.extend(self.get_changes(scans, lower_limit))

    return upper_limit_changes, lower_limit_changes

Hi, have you tried bash cron? Or there is a particular reason that you want to schedule it from the code? — Fernando Irarrázaval G
– Fernando Irarrázaval G, Commented Dec 30, 2017 at 5:49
I have to make the method run once every day and I need that to be done from code — Mindan
– Mindan, Commented Dec 30, 2017 at 5:51

Fernando Irarrázaval G · Accepted Answer · 2017-12-30 06:09:09Z

1

There are multiple ways of doing it, some of them documented on this question. Although there is an accepted answer, I would recommend trying the one that uses the library schedule (pip install schedule). The code looks like this:

import schedule
import time

def job(t):
    print "I'm working...", t
    return

schedule.every().day.at("01:00").do(job,'It is 01:00')

while True:
    schedule.run_pending()
    time.sleep(60) # wait one minute

edited Dec 30, 2017 at 6:09

answered Dec 30, 2017 at 5:59

Fernando Irarrázaval G

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4 Comments

Mindan Over a year ago

Thanks I will try that, but can you please write where "this question" link suppose to go?

Fernando Irarrázaval G Over a year ago

Fixed the link. If you found this response useful please upvote it and mark it as answered ;)

Mindan Over a year ago

i'm a bit confused, how do I call get the timer on to execute my method at the given time? I'm both new to python and to timer. I use Python 3

Fernando Irarrázaval G Over a year ago

The python program must be running a loop (the while True:) that checks if it is time to run a job. For the method to be executed you have to have executed the line schedule.every().day.at("01:00").do(job,'It is 01:00') once before. That line is saying that every day at 1am it should run the method job.

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