This book provides readers with an in-depth discussion of circuit simulation, combining basic electrical engineering circuit theory with Python programming. It fills an information gap by describing the development of Python Power Electronics, an open-source software for simulating circuits, and demonstrating its use in a sample circuit. Unlike typical books on circuit theory that describe how circuits can be solved mathematically, followed by examples of simulating circuits using specific, commercial software, this book has a different approach and focus. The author begins by describing every aspect of the open-source software, in the context of non-linear power electronic circuits, as a foundation for aspiring or practicing engineers to embark on further development of open source software for different purposes.  By demonstrating explicitly the operation of the software through algorithms, this book brings together the fields of electrical engineering and software technology. Written by a practicing engineer, with expertise in both power electronic circuits and Python programming, who developed an open-source circuit simulator from scratch; Based on a free and open source circuit simulator, which makes it accessible to everyone in the world to run the tests when reading the book; Supplemented by online tutorials on the simulator website, making the material vast compared to other books that are limited to selective cases.