How to make a timer in python that works like Qtimer?

Question

Python

I want to do a long action with a more or less precisely specified period comparable in order to the time of the action itself.
The duration of the action is unpredictable, but no more than a period.
There is such a function in QT, but since a graphical interface is not needed, I don’t want to drag QT with me, you never know where else you have to run it.
In which direction to dig.

Answer 1

shed ?