Now that we have seen an approach to creating our program using threads, callbacks, and OOP techniques, let's consider a third approach using a publisher-subscriber model.
The code for the publisher-subscriber approach can be found in the chapter12/version3_pubsub folder. You will find four files – the main program, main.py, and three class definitions: LED.py, BUTTON.py, and POT.py.
Please take the time now to stop and read through the code contained in main.py to get a basic understanding of how the program is structured and how it works. Then, proceed to review LED.py, BUTTON.py, and POT.py.
What you will have noticed is that the overall program structure (especially the class files) is very similar to the version2 thread/callback example that we covered in the previous heading.
You may also have realized that this approach is very similar in concept to the publisher/subscribing method...
