知行编程网知行编程网  2022-07-30 02:00 知行编程网 隐藏边栏 |   抢沙发  3 
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Python 协程与 JavaScript 协程的对比
剧照:《眷思量》

作者:从零开始的程序员生活

来源:https://www.cnblogs.com/lgjbky/p/14759463.html

前言

以前没怎么接触前端,对 JavaScript 的异步操作不了解,现在有了点了解。一查发现 Python 和 JavaScript 的协程发展史简直就是一毛一样!

这里大致做下横向对比和总结,便于对这两个语言有兴趣的新人理解和吸收。

共同诉求

  • 随着 cpu 多核化,都需要实现由于自身历史原因(单线程环境)下的并发功能
  • 简化代码,避免回调地狱,关键字支持
  • 有效利用操作系统资源和硬件:协程相比线程,占用资源更少,上下文更快

什么是协程?

总结一句话,协程就是满足下面条件的函数:

  • 可以暂停执行(暂停的表达式称为暂停点)
  • 可以从挂起点恢复(保留其原始参数和局部变量)
  • 事件循环是异步编程的底层基石

混乱的历史

Python 协程的进化

  • Python2.2 中,第一次引入了生成器
  • Python2.5 中,yield 关键字被加入到语法中
  • Python3.4 时有了 yield from(yield from 约等于 yield + 异常处理 + send), 并试验性引入的异步 I/O 框架 asyncio(PEP 3156)
  • Python3.5 中新增了 async/await 语法(PEP 492)
  • Python3.6 中 asyncio 库"转正" (之后的官方文档就清晰了很多)

在主线发展过程中,也出现了很多支线的协程实现如 Gevent。

event loop 将任务划分:

  • 主线程循环从"任务队列"中读取事件
  • 宏队列(macro task)js 同步执行的代码块,setTimeout、setInterval、XMLHttprequest、setImmediate、I/O、UI rendering等,本质是参与了事件循环的任务
  • 微队列(micro task)Promise、process.nextTick(node环境)、Object.observe, MutationObserver等,本质是直接在 Javascript 引擎中的执行的没有参与事件循环的任务

扩展阅读 Node.js 中的 EventLoop (http://www.ruanyifeng.com/blog/2014/10/event-loop.html)

总结与对比

说明 python JavaScript 点评
进程 单进程 单进程 一致
中断/恢复 yield,yield from,next,send yield,next 基本相同,但 JavaScript 对 send 没啥需求
未来对象(回调包装) Futures Promise 解决 callback,思路相同
生成器 generator Generator 将 yield 封装为协程Coroutine,思路一样
成熟后关键词 async、await async、await 关键词支持,一毛一样
事件循环 asyncio 应用的核心。事件循环会运行异步任务和回调,执行网络 IO 操作,以及运行子进程。asyncio 库支持的 API 较多,可控性高 基于浏览器环境基本是黑盒,外部基本无法控制,对任务有做优先级分类,调度方式有区别 这里有很大区别,运行环境不同,对任务的调度先后不同,Python 可能和 Node.js 关于事件循环的可比性更高些,这里还需需要继续学习

到这里就基本结束了,看完不知道你会有什么感想,如有错误还请不吝赐教。


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51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" 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