Asyncio.gather 与 asyncio.wait [英] Asyncio.gather vs asyncio.wait

问题描述

asyncio.gather 和 asyncio.wait 似乎有类似的用途:我有一堆异步的东西要执行/等待(不一定要在下一个开始之前等待一个完成).它们使用不同的语法，并且在一些细节上有所不同，但对我来说，拥有两个功能上有如此巨大重叠的函数似乎非常不符合 Python 风格.我错过了什么?

asyncio.gather and asyncio.wait seem to have similar uses: I have a bunch of async things that I want to execute/wait for (not necessarily waiting for one to finish before the next one starts). They use a different syntax, and differ in some details, but it seems very un-pythonic to me to have 2 functions that have such a huge overlap in functionality. What am I missing?

推荐答案

虽然在一般情况下类似(运行并获得许多任务的结果")，但每个函数对于其他情况都有一些特定的功能:

Although similar in general cases ("run and get results for many tasks"), each function has some specific functionality for other cases:

返回一个 Future 实例，允许对任务进行高级分组:

Returns a Future instance, allowing high level grouping of tasks:

import asyncio
from pprint import pprint

import random


async def coro(tag):
    print(">", tag)
    await asyncio.sleep(random.uniform(1, 3))
    print("<", tag)
    return tag


loop = asyncio.get_event_loop()

group1 = asyncio.gather(*[coro("group 1.{}".format(i)) for i in range(1, 6)])
group2 = asyncio.gather(*[coro("group 2.{}".format(i)) for i in range(1, 4)])
group3 = asyncio.gather(*[coro("group 3.{}".format(i)) for i in range(1, 10)])

all_groups = asyncio.gather(group1, group2, group3)

results = loop.run_until_complete(all_groups)

loop.close()

pprint(results)

可以通过调用group2.cancel() 甚至all_groups.cancel() 来取消组中的所有任务.另见 .gather(..., return_exceptions=True),

All tasks in a group can be cancelled by calling group2.cancel() or even all_groups.cancel(). See also .gather(..., return_exceptions=True),

支持在第一个任务完成后或指定超时后等待停止，允许较低级别的操作精度:

Supports waiting to be stopped after the first task is done, or after a specified timeout, allowing lower level precision of operations:

import asyncio
import random


async def coro(tag):
    print(">", tag)
    await asyncio.sleep(random.uniform(0.5, 5))
    print("<", tag)
    return tag


loop = asyncio.get_event_loop()

tasks = [coro(i) for i in range(1, 11)]

print("Get first result:")
finished, unfinished = loop.run_until_complete(
    asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED))

for task in finished:
    print(task.result())
print("unfinished:", len(unfinished))

print("Get more results in 2 seconds:")
finished2, unfinished2 = loop.run_until_complete(
    asyncio.wait(unfinished, timeout=2))

for task in finished2:
    print(task.result())
print("unfinished2:", len(unfinished2))

print("Get all other results:")
finished3, unfinished3 = loop.run_until_complete(asyncio.wait(unfinished2))

for task in finished3:
    print(task.result())

loop.close()

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