异步/等待做什么? [英] What does async/await do?

问题描述

我正在尝试用python绕过异步/等待.

I'm trying to wrap my head around async/await in python.

我在正确的轨道上吗?

• async和@coroutine函数返回协程/生成器，而不是返回值.

• await提取协程/发电机的实际返回值.
  

• async and @coroutine functions returns coroutine/generator, not the returned value.

• await extracts the actual return value of coroutine/generator.
   

async函数结果(协程)应添加到事件循环中.

async function result (coroutines) is meant to be added to event-loop.

@coroutine的yield直接与事件循环通信. (跳过等待结果的直接呼叫者)

@coroutine's yield communicates directly with event-loop. (skipping direct caller which awaits the result)
 

await仅可在异步函数内使用.

await can be used only inside async functions.

(@coroutine = @types.coroutine)

推荐答案

async和@coroutine函数返回协程/生成器，而不是返回值

async and @coroutine functions returns coroutine/generator, not the returned value

从技术上讲，types.coroutine返回基于生成器的协程，该协程不同于生成器，也不同于协程.

To be technical, types.coroutine returns a generator-based coroutine which is different than generators and different than coroutines.

await提取协程/发电机的实际返回值.

await extracts the actual return value of coroutine/generator.

await ，类似于yield from ，暂停协程的执行，直到等待完成并返回结果为止.

await, similar to yield from, suspends the execution of the coroutine until the awaitable it takes completes and returns the result.

异步功能结果(协程)应添加到事件循环中.

async function result (coroutines) is meant to be added to event-loop.

是的.

await在事件循环和等待的协程之间建立桥梁"(启用下一个点).

await creates "bridge" between event-loop and awaited coroutine (enabling the next point).

await创建一个挂起点，该挂起点指示事件循环某些I/O操作将发生，从而允许它切换到另一个任务.

await creates a suspension point that indicates to the event loop that some I/O operation will take place thereby allowing it to switch to another task.

@协程的产量直接与事件循环通信. (跳过等待结果的直接呼叫者)

@coroutine's yield communicates directly with event-loop. (skipping direct caller which awaits the result)

不，基于生成器的协程使用yield from的方式与await相似，而不是yield.

No, generator-based coroutines use yield from in a similar fashion to await, not yield.

await只能在异步函数中使用.

await can be used only inside async functions.

是的

产量只能在协程内部使用.

yield can be used only inside coroutine.

yield from可以在基于生成器的协程(用types.coroutine装饰的生成器)内部使用，并且自Python 3.6起，可以在async函数中使用，从而生成异步生成器.

yield from can be used inside generator-based coroutines (generators decorated with types.coroutine) and, since Python 3.6, in async functions that result in an asynchronous generator.

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