This is the older 2020 edition (for Python 3.9). The fourth edition was released in 2025, updated for Python 3.14.Revised, expanded, and all new material on structuring your code and using third party themes and widgets.Quickly learn the right way to build attractive and modern graphical user interfaces with Python and Tkinter.You know some Python. You want to create a user interface for your application. You don't want to waste time messing around with things you don't need.Enter Tkinter.It's built right into Python. Everything you need is included in the standard Python distributions. No extra downloads. Your Python and Tkinter scripts will work on Windows, Mac and Linux.Tkinter has a simple, clean, Pythonic API and takes care of much of the housekeeping needed in GUI programming. You can focus on what's unique in your application.One HUGE Problem.Tkinter has been around for a very long time. There's a lot of documentation, much of it created years ago. Nearly everything you'd find in that documentation still works today.But it's all wrong.Tkinter has a reputation for ugly and outdated user interfaces that don't fit in with modern systems. And if you follow the old documentation, that's exactly what you'll get.Because Tkinter has taken a quantum leap forward since all that documentation was written. There are new and better ways to build your user interface. Your program needs to be written differently to take advantage of that.Modern Tkinter shows you the right way to do it.You'll learn all the modern best practices. You'll build your user interface the right way the first time, without having to learn anything extra or irrelevant. It starts at the beginning, shows you what you need to know, and covers all the essential elements of building your modern user interface. This includes:all the standard GUI widgetsattractively laying out your user interfacemanaging menus, windows, and standard dialogsorganizing more complex user interfacesTkinter's powerhouse widgets: canvas and textcustomizing the look of your user interfacemaking it all work on Mac, Windows, and LinuxWho this book is forThis book is for everyday Python programmers looking to quickly create desktop user interfaces. You may be new to Tkinter, or want to bring your knowledge up to date. You don't need to be an expert on OOP, MVC architecture, multithreading or any other advanced topics. In fact, you're not going to see any of those things in this book.This book uses Python 3.9, but everything you learn will apply (with small tweaks) to any Python 3.x version.Let veteran software developer Mark Roseman show you the right way to build user interfaces with Python and Tkinter. He's been using and Tk (the technology behind Tkinter) since its early days and has shipped dozens of open source tools and commercial applications based on it.