Python asyncio 无法工作

Question

我想使用 asyncio 获取一组图像的大小。

传入一组url，希望得到三个值，(x, y, channel)。

但是，我什么也得不到。

我的代码有问题吗？

from PIL import Image
from io import BytesIO
import numpy as np
import asyncio
import concurrent.futures
import requests

def get_image_shape(path):
    try:
        img = Image.open(BytesIO(requests.get(path).content))
        arr = np.array(img, dtype = np.uint8)
        return arr.shape
    except:
        return (0,0,0)

async def main(url_list):
    loop = asyncio.get_event_loop()
    futures = [
        loop.run_in_executor(
            None, 
            get_image_shape, 
            url
        )
        for url in url_list]
    for response in await asyncio.gather(*futures):
        pass

loop = asyncio.get_event_loop()
loop.run_until_complete(main(url_list))

#response.result()
#[(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0)]

Answer 1

试试这个：

from PIL import Image
from io import BytesIO
import numpy as np
import asyncio
import concurrent.futures
import requests

def get_image_shape(path):
    try:
        img = Image.open(BytesIO(requests.get(path).content))
        arr = np.array(img, dtype = np.uint8)
        return arr.shape
    except:
        return (0,0,0)

async def main(url_list):
    loop = asyncio.get_event_loop()
    futures = [
        loop.run_in_executor(
            None, 
            get_image_shape, 
            url
        )
        for url in url_list]
    return [response for response in await asyncio.gather(*futures)]

loop = asyncio.get_event_loop()
response = loop.run_until_complete(main(url_list))

Python asyncio 无法工作

Python asyncio cannot work

python

python-asyncio