Python Forum

What is the best site or book to learn advanced python programming?
Ex: modules like Sub Process and OS

How to think like a computer scientist: http://www.greenteapress.com/thinkpython/thinkCSpy.pdf
tutorial (my choice): https://www.python-course.eu/python3_course.php

This is only a small sample, there are many others

I'd say the Think CS one is intro, not "advanced." If you just want to learn those modules, I'd go straight to the docs for them. Otherwise "advanced" is vague, better to find a project or some task you're not sure how to accomplish and use that as a basis.