Clean Code in Python, Second Edition

Originally titled Clean Code in Python, Second Edition, this book is a guide to code quality and engineering practice for Python developers. The Chinese edition was translated by Yuan Guozhong and published by People's Posts and Telecommunications Press in September 2022. Taking the new features introduced in Python 3.9 as its technical baseline, the book centers on the question of what makes code clean, starting from code formatting, docstrings, and the development toolchain and moving progressively to idiomatic Python and then to design principles and architecture at the software engineering level. The book discusses how to build an efficient development environment with automation tools and how to catch problems early with type-consistency checks and code-validation tools; how to use Python-specific mechanisms—magic methods, properties, descriptors, decorators, generators, and asynchronous programming—to write more compact and expressive code; how to handle complex business logic through design by contract, defensive programming, abstraction, and encapsulation, and how to eliminate duplication and reduce coupling with SOLID principles and common design patterns; and how to drive refactoring with unit tests, ultimately making a clean codebase the foundation of a solid architecture. The main text comprises 10 chapters, plus a conclusion and references, running to roughly 300 pages. The author stresses that clean code is not a one-off cleanup but an ongoing habit spanning requirements understanding, abstract design, testing, and refactoring: only when code meets standards of readability, maintainability, and extensibility at the same time can a team iterate over the long term at low cost.