目录1. 为什么需要with语句？(The Problem)2.with语句是什么以及如何使用？(The Solution)3.with的工作原理：上下文管理器协议 (The Magic Behind)4. 如何创建自己的上下文管理器？方式一：基于类的实现方式二：基于
In C (or C++ for that matter), pointers are special if they have the value zero: I am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn\'t dang
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