Communicate between my python library and ros [closed]

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I have a python class called primitive_surfaces that uses the script called primitive_shapes.py to find waypoints. Initially, I had a main that would instantiate an object of primitive_surfaces with required arguments and print out the waypoints. I'm now planning to use this code and publish the variable waypoints using ROS. How can I communicate between non-ROS Python scripts and ROS?

Apologies if this question has been repeated many times, I'm fairly new to ROS and couldn't seem to find anything relevant. Thanks :)