Create your collection of functions and put them in a file. Then use it like this. See that the file name becomes the module name. That applies for other libraries as well. The string library would be stored in a file called string.py .
Many papers uses the terms class and class instance.
I don't like them because they can be hard to understand. I will use classes and objects instead in this article. Class is well, class, and object is what you create from the class. Object is run-time. This is how you declare an empty class.