Python One-Liners: Write Code Like an Expert

This book is the Chinese translation of Python One-Liners by Christian Mayer, translated by Su Dan and published by Publishing House of Electronics Industry in 2021. It is aimed at Python learners who are moving from beginner to intermediate level. Its core purpose is not to teach you to make code as short as possible, but to use the one-liner as an extreme practice ground for training a deep understanding of Python language features and the ability to break code down. The book follows a consistent chapter rhythm: first it presents the background of a specific problem, then gives a one-line solution, and then unpacks segment by segment why that line works and which syntax and library functions it uses. The book has six chapters, covering Python language fundamentals (data structures, containers, comprehensions, control flow, functions and lambda), common programming techniques (filtering data with list comprehensions, reading files, finding matching substrings with slicing, combining map and lambda, and so on), data science computing based on NumPy, concise implementations of major machine learning algorithm models (such as linear regression and K-Means clustering), advanced regular expressions, and one-line implementations of several classic computer science algorithms. The appendix and afterword also touch on topics such as recursion. In the preface, the author specifically discusses the key premise of readability: one-liners are a microscope for understanding the language, not a style guide for engineering code. As readers follow the case breakdowns and analyses in the book, they will gradually master advanced techniques such as list comprehensions, generators, slicing, lambda, and functional-style coding, and learn to judge in real projects when to be concise and when to be clear. The book is about 347,000 Chinese characters, with more than 200 pages of main text, and is suitable as an advanced exercise book after learning basic Python syntax.