Yifei Kong

Oct 13, 2018

Python 高性能请求库 aiohttp 的基本用法

aiohttp 是 Python 异步编程最常用的一个 web 请求库了, 依托于 asyncio, 性能非常吓人. 下面列举几个常见的用法:

最基础: 并发下载网页

import aiohttp
import asyncio

async def fetch(session, url):
    async with session.get(url) as response:
        return await response.text()

async def main():
    urls = [
            'http://python.org',
            'https://google.com',
            'http://yifei.me'
        ]
    tasks = []
    async with aiohttp.ClientSession() as session:
        for url in urls:
            tasks.append(fetch(session, url))
        htmls = await asyncio.gather(*tasks)
        for html in htmls:
            print(html[:100])

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
posted at 17:05  ·   ·  Python  编程语言  计算机