4.24aiohttp模块学习

下载：pip install aiohttp

案例练习：爬取优美图库图片

# requests.get() 同步的代码 -> 异步操作aiohttp
# pip install aiohttp

import asyncio
import aiohttp

urls = [
    "http://kr.shanghai-jiuxin.com/file/2020/1031/191468637cab2f0206f7d1d9b175ac81.jpg",
    "https://d1icd6shlvmxi6.cloudfront.net/gsc/9YL27B/dc/fe/9c/dcfe9cd3c23641dc82aa8a15b44f7caa/images/login/u10.png?token=2800dd9468999f997788328d3f28019bfe1fcab8057c1d57e742ed0c32e45928",
    "http://kr.shanghai-jiuxin.com/file/2020/1031/774218be86d832f359637ab120eba52d.jpg"
]


async def aiodownload(url):
    # 发送请求.
    # 得到图片内容
    # 保存到文件
    name = url.rsplit("/", 1)[1]  # 从右边切, 切一次. 得到[1]位置的内容
    async with aiohttp.ClientSession() as session:  # requests
        async with session.get(url) as resp:  # resp = requests.get()
            # 请求回来了. 写入文件
            # 可以自己去学习一个模块, aiofiles
            with open(name, mode="wb") as f:  # 创建文件
                f.write(await resp.content.read())  # 读取内容是异步的. 需要await挂起, resp.text()

    print(name, "搞定")


async def main():
    tasks = []
    for url in urls:
        tasks.append(aiodownload(url))

    await asyncio.wait(tasks)


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