How to implement an event handler in Python?

Question

Python

There is a task:
The function passes through the base and takes the time from there (Tbase + 6 hours - Tnow), based on this time, the function "falls asleep" for example, for 4 hours 37 minutes. Then the function wakes up, does its business, calculates the sleep time and falls asleep.
Recommend documentation and examples with a similar implementation.

Answer 1

if you just need the function to fall asleep time.sleep(sleep_time)
if you need an event handler by timer, you are here, there is a good example at the end:
https://docs.python.org/2/library/signal.html

Answer 2

In an endless loop, read the time from the database, calculate the sleep time, sleep, complete the desired task, and again at the beginning of the loop.