Mastering GUI Programming with Python

Module-style structure

As programmers, we tend to think of applications and libraries as two very different things, but, in truth, well-structured applications aren't that different from libraries. A library is just a collection of ready-made classes and functions. Our application is mostly just class definitions as well; it just happens to have a few lines of code at the end that allow it to be executed as an application. When we see things this way, structuring our application as a Python library module makes a lot of sense. To do this, we're going to convert our single Python file to a directory full of files, each containing an individual unit of code.

The first step is to consider our project's name; right now, that name is ttt-qt.py ...