"Python Code Snippets" includes commonly used Python codes, covering many aspects of Python programming: lists, strings, dictionaries, file handling, networks, databases, error handling, etc., which can significantly improve the efficiency of our programming. It's a dynamically updated book, with new content added all the time.

HTML, CSS, and JavaScript are the three cornerstones of the web front-end, and proficiency in them is a must-have basic skill for web front-end workers. This book focuses on CSS, one of the three cornerstones of the web front-end, especially the theoretical knowledge and practical application of CSS, and strives to describe the core concepts of CSS and their applications to you in accurate, concise and vivid language.