I have developed a small system in Python, but I have not defined classes. They are simply files with functions that call each other and a file
I am now trying to represent this system, but I can not find the indicated diagram to explain the functioning of the system. Of course, I have made use cases, but I would like to represent the responsibilities of each function and how each one is invoked. The collaborations between them.
With what model can I represent it? Are there types of pre-defined diagrams for this type of systems?