Summary
The application has really come a long way. In this chapter, we learned about Tkinter validation, created a validation mixin class, and used it to create validated versions of the Entry, Combobox, and Spinbox widgets. We also learned how to validate widgets like Radiobutton, which don't support the built-in validation framework. We validated different kinds of data on keystrokes and focus events, and created fields that dynamically change state or update their constraints based on the values of related fields. Finally, we automated input on several fields to reduce the amount of manual data entry required by the user.
In the next chapter, we're going to prepare our code base for expansion by learning how to organize a large application for easier maintenance. More specifically, we'll learn about the MVC pattern and how to structure our code in multiple files for simpler maintenance. We'll also learn about version control software and how it can help...
