title: Timed method in Python
body: <p>How do I have a part of python script(only a method, the whole script runs in 24/7) run everyday at a set-time, exactly at every 20th minutes? Like 12:20, 12:40, 13:00 in every hour.</p>
  
  <p>I can not use cron, I tried periodic execution but that is not as accurate as I would... It depends from the script starting time.</p>