call a method at a certain time (python)

Question

What is the proper way to call a method at a certain time (certain time here is a parameter)?

I need the timer, but is it necessary to represent incoming time and time.now() in seconds to get and to use the difference between them?

The code:

import datetime, time
import threading
from threading import Timer

def doItThen():
    print ("did it")

def launchTimer(dateAndTime):
    dateTimeNow = datetime.datetime.now()
    t = threading.Timer((dateAndTime-dateTimeNow).seconds, doItThen)
    t.start()

if __name__ == "__main__":

    launchTimer(datetime.datetime(2018, 2, 21, 8, 27, 51))

the result:

did it

(works)

but what are the risks in using this approach? im not good in testing or predicting the weeknesses

Try the method you propose and edit your post to include the result — ndmeiri, Feb 18 '18 at 07:57
I am thinking about using this kind of the routine: t1 = datetime (2010, 1, 1, 1, 1, 1) // t2 = datetime.now() // t = threading.Timer((t1-t2).seconds, doItThen) // t.start() ... don't know if it's a proper way to do it — Roman Kishmar, Feb 20 '18 at 10:47

score 2 · Answer 1 · answered Feb 18 '18 at 08:12

Check out scheduler.enterabs from Python's Sched lib.

The enterabs function allows you to set a specific time to call a function. Here's a direct link.

The basic syntax is as follows:

scheduler.enterabs(time, priority, action, argument=(), kwargs={})

score 1 · Accepted Answer · answered Feb 18 '18 at 08:08

If I understand your question correctly, the module schedule might be what you are looking for.

How do I get a Cron like scheduler in Python?

import schedule
import time 
def job(): 
    print("I'm working...")     

schedule.every(10).minutes.do(job)
schedule.every().hour.do(job) 
schedule.every().day.at("10:30").do(job) 
while 1: 
    schedule.run_pending()
    time.sleep(1)

score 0 · Answer 3 · answered Feb 18 '18 at 08:04

0

use python schedule

schedule.every().day.at("10:10").do(job)

answered Feb 18 '18 at 08:04

mirhossein

682
7
16

1

I need to call a method at a random time. It's not periodic or predictable. – Roman Kishmar Feb 18 '18 at 08:11
explaint what exactly you are going to do by this. also you can make a random timestamps and pu it in a list like [1518942118,1518942125,...] then run it with schedule – mirhossein Feb 18 '18 at 08:22

call a method at a certain time (python)

3 Answers3