This is the Python material that does not get left behind. Almost none of it is replaced by a framework later. Learn it, and keep this cheat sheet close by as a handy reference.

Slicing bytes copies. On a small payload nobody notices, but slice a large packet or image buffer in a loop and the copies ...

十五年前我刚接触Python时，总喜欢用一堆函数和全局变量解决问题。直到接手一个电商系统项目，面对上千行纠缠不清的代码，才真正理解面向对象的价值。面向对象编程（OOP）不是语法糖 ...

Standards and guidelines for development co-operation with concrete examples of their implementation ...