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I’ve worked at many interesting and varied jobs in my life and have been fortunate enough to be a software developer for almost 40 years. In that time, I’ve learned and worked with quite a few programming languages—Pascal, Fortran, C, C++, Visual Basic, PHP, Python, and JavaScript—and applied these languages to work in quite a few industries. Using all these languages and having these experiences taught me a great deal. C taught me how to use—and certainly abuse—pointers and gave me a thirst to optimize my applications for speed. C++ taught me about object-oriented programming (OOP), a way of thinking in which I’m still firmly rooted. PHP was my first exposure to a scripting language, and it taught me that maybe it was okay not to manage everything, like memory, myself. PHP also brought with it my first dive into web development and the nascent ideas of browsers as an application platform. It’s been almost two decades since I discovered Python, and it has been my sweet spot for application development ever since. The language helped to crystalize the vague thoughts I had about development, the idea that there should be one obvious way to do things. Being able to use multiple concepts about development—like OOP, procedural, and functional programming—all in the same language is very valuable. A language can be relatively easy to learn and expressive, and yet seemingly have no ceiling on the kinds of problems it can be used to solve. Because I was excited about Python, I wanted to promote it and encourage others to jump on board. This led me to give presentations and teach classes within the organizations where I worked. I also had the chance to teach Python at a STEM facility near my hometown to kids aged 8 to 16. It’s a tossup which way the lessons were actually going, as I learned a lot from the kids in the class. Each class taught me more about how to present material in a more accessible way. It was apparent when something I was teaching was working or not by how hard I had to work to keep the kids from switching over to Minecraft on their laptops. For the presentations and class work, I was writing my own Python material. I wanted to do more of this, which led to writing articles for RealPython.com. I wrote several well-received articles for the site, which was gratifying. Those articles were how I connected with Manning. An acquisitions editor reached out to me, and we talked about writing a Python book for them and what that would look like. The result of those conversations is this book, which will help you along your journey to becoming a developer. Python is a wonderful, expressive, and enjoyable tool to bring with you. I’ve enjoyed the journey for a long time and am still doing so. That is my goal for the book, and I hope this book helps you reach your goals.