【Python】爬虫-----异步http请求

import asyncio
import  aiohttp

urls = [
    "https://cdn.pixabay.com/photo/2021/11/16/08/13/window-6800397_960_720.jpg",
    "https://cdn.pixabay.com/photo/2021/01/29/11/33/game-5960731_960_720.jpg",
    "https://cdn.pixabay.com/photo/2021/11/13/12/19/cochem-castle-6791148_960_720.jpg"
]


async def aiodownload(url):    #async 异步操作开头都得写
    name = url.rsplit("/",1)[1] #设置文件的名字,resplit()是从后面开始截的
    async with aiohttp.ClientSession() as session: #这里用with的原因是，with会有文件管理层自动帮我们执行close函数
        async with session.get(url) as resp:
            with open(name, mode='wb') as f:
                f.write(await resp.content.read())
    print(name,"t ")

async def main():
    tasks = []
    for url in urls: #把链接写进url
        tasks.append(aiodownload(url)) #把返回的结果写进tasks
    await asyncio.wait(tasks) #把tasks传进异步协程

if __name__ == '__main__':
    asyncio.run(main())