April 2023
Intermediate to advanced
769 pages
25h 16m
Chinese
Content preview from 流畅的Python（第2版）
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异步编程
｜
631
async with TaskGroup(wait=all) as g:
await g.spawn(coro1)
await g.spawn(coro2)
await g.spawn(coro3)
print('Results:', g.results)
任务组支持
结构化并发
，这种并发编程形式限制异步任务组中的所有活动只有一个出入
口。这类似于结构化编程，避开了
GOTO
命令，引入了块语句，限制循环和子例程的出入
口。用作异步上下文管理器的
TaskGroup
，确保在退出所在的块时，内部派生的所有任务
都已完成或被撤销，异常也已抛出。
在即将发布的
Python
版本中，
asyncio
可能会采用结构化并发。获准在
Python 3.11
中实现的“
PEP 654–Exception Groups and except*
”就是明显迹象。
“
Motivation
”一节提到了
Trio
的“
nurseries
”（对任务组的称呼）：“参照
Trio
nurseries
，为
asyncio
实现更好的任务派生
API
，这是本
PEP
的主要动机。”
Curio
的另一个重要特色是对在同一份基准代码中使用协程和线程编程提供了更好的支
持——这对大部分重要的异步程序来说是必不可少的。以
await spawn_thread(func, ...)
启动进程，返回一个
AsyncThread
对象，接口与
Task
类似。借助特殊的
AWAIT(coro)
函数
（全大写，因为现在
await
是关键字），线程可以调用协程。
Curio ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.