# 十三、标准库

Python 总是“自带电池”。这句话的意思是标准的 CPython 发行版自带一些库，可用于文件、线程、网络、网站、音乐、键盘、屏幕、文本等，还有一系列实用工具。

CPython 的这些“自带电池”就像是五号电池，几乎适用于任何场合，例如 `collections` 模块和 `sys` 模块。但也有些不常用的模块，就像小型手表电池那样：你不知道它们在什么时候会派上用场。

CPython 标准库中有两种模块类型：

1. 用纯 Python 编写的功能模块
2. 用 C 编写并用 Python 进行封装的模块

你将在本章中探索这两种模块类型。


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