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### 装饰器

Python 语言中，装饰器是“**用一个函数装饰另外一个函数并为其提供额外的能力**”的语法现象。装饰器本身是一个函数，它的参数是被装饰的函数，它的返回值是一个带有装饰功能的函数。通过前面的描述，相信大家已经听出来了，装饰器是一个高阶函数，它的参数和返回值都是函数。但是，装饰器的概念对编程语言的初学者来说，还是让人头疼的，下面我们先通过一个简单的例子来说明装饰器的作用。假设有名为`downlaod`和`upload`的两个函数，分别用于文件的上传和下载，如下所示。
Python 语言中，装饰器是“**用一个函数装饰另外一个函数并为其提供额外的能力**”的语法现象。装饰器本身是一个函数，它的参数是被装饰的函数，它的返回值是一个带有装饰功能的函数。通过前面的描述，相信大家已经听出来了，装饰器是一个高阶函数，它的参数和返回值都是函数。但是，装饰器的概念对编程语言的初学者来说，还是让人头疼的，下面我们先通过一个简单的例子来说明装饰器的作用。假设有名为`download`和`upload`的两个函数，分别用于文件的上传和下载，如下所示。

```python
import random
Expand Down