Now that you've installed Python 3, learned to use IDLE, gotten a taste of the simplicity and power of Tkinter, and have seen how to begin structuring it for more complicated applications, it's time to start writing a real application.
In the next chapter, you'll start your new job at ABQ AgriLabs and be presented with a problem that will need to be solved with your programming skills and Tkinter. You will learn how to dissect this problem, develop a program specification, and design a user-friendly application that will be part of the solution.