从作为异步任务运行的函数中获取值 [英] Getting values from functions that run as asyncio tasks

问题描述

我正在尝试以下代码:

import asyncio

@asyncio.coroutine
def func_normal():
        print("A")
        yield from asyncio.sleep(5)
        print("B")
        return 'saad'

@asyncio.coroutine
def func_infinite():
    i = 0
    while i<10:
        print("--"+str(i))
        i = i+1
    return('saad2')

loop = asyncio.get_event_loop()

tasks = [
    asyncio.async(func_normal()),
    asyncio.async(func_infinite())]

loop.run_until_complete(asyncio.wait(tasks))
loop.close()

我不知道如何从这些函数中获取变量中的值.我不能这样做:

I can't figure out how to get values in variables from these functions. I can't do this:

asyncio.async(a = func_infinite())

因为这会使它成为关键字参数.我该如何完成这项工作?

as this would make this a keyword argument. How do I go about accomplishing this?

推荐答案

协程按原样工作.只需使用 loop.run_until_complete() 和 调用asyncio.gather() 收集多个结果:

The coroutines work as is. Just use the returned value from loop.run_until_complete() and call asyncio.gather() to collect multiple results:

#!/usr/bin/env python3
import asyncio

@asyncio.coroutine
def func_normal():
    print('A')
    yield from asyncio.sleep(5)
    print('B')
    return 'saad'

@asyncio.coroutine
def func_infinite():
    for i in range(10):
        print("--%d" % i)
    return 'saad2'

loop = asyncio.get_event_loop()
tasks = func_normal(), func_infinite()
a, b = loop.run_until_complete(asyncio.gather(*tasks))
print("func_normal()={a}, func_infinite()={b}".format(**vars()))
loop.close()

输出

--0
--1
--2
--3
--4
--5
--6
--7
--8
--9
A
B
func_normal()=saad, func_infinite()=saad2

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