We have come to the end of this chapter. So, what is it that we achieved here? Let's have a look at all the key things that we learned from the chapter.

We learned how to structure programs using the MVC architecture.

We took a peek at the versatility and power of the Tkinter Canvas widget. This included a tour through the basic usage of the canvas coordinates, object IDs, and tags.

We discussed how to handle complexity by implementing programs in a modular structure. We achieved this modularity by breaking down the code into several smaller files. We handled the entire configuration from a single file and all the errors in another file.

We explored how to extend Python's built-in error class to define a custom error and exceptions. We also had a look at how we can extend Python's built-in data types, as in the case of the Model class, which directly extended the dict class.
We studied how to use object inheritance to code classes with similar attributes and behavior when building the Piece class and all its subclasses.

Finally, you learned how to use Python's built-in configparser module to store user preferences. 

We will create an audio player in the next chapter. In addition to this, we'll work with several new widgets. We will also take a look at how to create our own widgets!