python asyncio如何使用

node2:/root/python3#cat t17.py 
import asyncio
import aiohttp
import time

async def download_one(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as resp:
            print('Read {} from {}'.format(resp.content_length, url))

async def download_all(sites):
    tasks = [asyncio.create_task(download_one(site)) for site in sites]
    await asyncio.gather(*tasks)

def main():
    sites = [
        'http://192.168.137.3:9000/test111/',
        'http://192.168.137.3:9000/test222/',
        'http://192.168.137.3:9000/test333/',
	'http://192.168.137.3:9000/test444/'
    ]
    start_time = time.perf_counter()
    asyncio.run(download_all(sites))
    end_time = time.perf_counter()
    print('Download {} sites in {} seconds'.format(len(sites), end_time - start_time))
    
if __name__ == '__main__':
    main()
node2:/root/python3#python3 t17.py 
Read 16 from http://192.168.137.3:9000/test111/
Read 16 from http://192.168.137.3:9000/test222/
Read 16 from http://192.168.137.3:9000/test333/
Read 16 from http://192.168.137.3:9000/test444/
Download 4 sites in 8.02225942001678 seconds

本文地址：https://blog.csdn.net/zhaoyangjian724/article/details/108237069