Sleep for exact time in python

Question

I need to wait for about 25ms in one of my functions. Sometimes this function is called when the processor is occupied with other things and other times it has the processor

Answer 1

What you intend to do is a real time application. Python (and probably the OS you are using) is not intended to program this kind of applications, where time restriction is so strict.

In order for you to achieve what you are looking for you need a RTOS (Real Time Operating System) and develop your application using a suitable programming language (usually C) following RT best practises.