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Thank you for purchasing the MEAP of my book, Software Design for Python Programmers. When I teach this course to my university students, I tell them the goal is that by the end of the semester, they’ll all be much better programmers. I want the same goal for my book; by the end of it, you’ll be a much better programmer. You should have the same “course prerequisites” — basic knowledge of object-oriented programming in Python. The book’s examples use Python 3.12, but I tried to ensure that the design techniques can apply to earlier versions of the language or to any other modern object-oriented language. Each example program is simple to run on the command line. How do you become a better programmer? The key is good software design. I teach design principles and design patterns. Examples of design principles include Single Responsibility, Encapsulation, Delegation, and Code to the Interface. Applying these principles will improve your code when you’re solving common programming problems that you encounter as you develop an application. Design patterns exist at a higher plane of software design, but they are based on the design principles. Design patterns, such as the Observer Pattern and the Visitor Pattern, are industryproven solutions to common software architecture problems that you can adapt for your applications. Well-designed software does what it’s supposed to do and is flexible, reliable, maintainable, and costs less time and money. The best way to teach and to learn is through examples. My book contains many “before” and “after” programming examples. I first show a poorly design example and we discover its shortcomings. Then I show an “after” version that uses a design principle or a design pattern and highlight the benefits of the better design. I drew many diagrams to illustrate the good and bad designs. Students often ask questions in my classes, and I’ve tried to capture the most common ones with imagined Q and A conversations interspersed throughout the text. I teach practical techniques and not abstract theoretical material. Besides teaching this course successfully at the university level, my experience includes decades of software development in both industry and scientific research. I was a senior scientist at NASA and JPL where I designed and developed software for the Mars rovers and the Orion spacecraft. I also had research and development positions at IBM Research and the Lawrence Livermore National Laboratory. In my earlier career, I was a senior software developer and engineering manager at various Silicon Valley companies such as Apple and Sun Microsystems. I have always been passionate about good software design, and I hope that shows in my book writing.