知行编程网知行编程网  2022-05-19 02:00 知行编程网 隐藏边栏 |   抢沙发  1 
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学习 Python 这么久了,说起 Python 的优雅之处,能让我脱口而出的, Descriptor(描述符)特性可以排得上号。

描述符 是Python 语言独有的特性,它不仅在应用层使用,在语言语法糖的实现上也有使用到(在下面的文章会一一介绍)。

当你点进这篇文章时

  • 你也许没学过描述符,甚至没听过描述符。
  • 或者你对描述符只是一知半解

无论你是哪种,本篇都将带你全面的学习描述符,一起来感受 Python 语言的优雅。

1. 为什么要使用描述符?

假想你正在给学校写一个成绩管理系统,并没有太多编码经验的你,可能会这样子写。

引导程序逻辑进入描述符之后,不管你是获取属性,还是设置属性,都是直接作用于 instance 的。

这个 Python 知识点,90% 的人都得挂~

这段代码,你可以仔细和前面的对比一下。

不难看出:

  • 之前的错误代码,更像是把描述符当做了存储节点。
  • 之后的正确代码,则是把描述符直接当做代理,本身不存储值。

以上便是我对描述符的全部分享,希望能对你有所帮助。

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rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里,领取新手福利</span></section></section></section></section></section></section></section>

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