I am working on a project which accurate timer is really crucial. I am working on `python` and am using `timer.sleep()` function. 

I noticed that `timer.sleep()` function will add additional delay because of the scheduling problem (refer to [`timer.sleep` docs](https://docs.python.org/2/library/time.html#time.sleep)). Due to that issue, the longer my program runs, the more inaccurate the timer is. 

Is there any more accurate timer/ticker to sleep the program or solution for this problem?

Any help would be appreciated. Cheers.