Summary
Hopefully, this book has provided you a solid introduction to basic Python concepts. By no means are you an expert as Python is a powerful language that can do a lot more than can be presented in one book. However, if you worked through each of the games, you will have a solid Python foundation on which to build your next steps.
One way to keep using Python is to continue to work on challenges and games while digging into code architecture, classes and objects, and more advanced game coding using objects, custom images, sounds, and other effects. Python is not used in traditional game systems, but game design concepts work well in any object-oriented language. Once you are comfortable in Python, you can move toward more common game design languages, such as C++, with a lot more ease.
Another way to use Python is to learn more about data applications and how to use Python to work with different kinds of data and mathematics. This is a really great way to get further into exploring Python...