python 协程并发下载图片

 1 import aiohttp
 2 import asyncio
 3 import time
 4
 5 async def dl_coroutine(session,url):
 6     print('开始下载图片%s' + url)
 7     async with session.get(url, verify_ssl=False) as res:
 8         content = await res.content.read()
 9         t = time.time()
10         filename = './img/{}.jpg'.format(int(round(t*1000)))
11         with open(filename,mode='wb') as f:
12             f.write(content)
13         print('下载完成')
14 async def main():
15     async with aiohttp.ClientSession() as session:
16         imglist = [
17             'https://img.zhankr.net/bc325zqpvfy298559.jpg',
18             'https://img.zhankr.net/yk2niujslbj298560.jpg',
19             'https://img.zhankr.net/bchh3ji0cx1298561.jpg'
20         ]
21         tasks = [ asyncio.create_task(dl_coroutine(session,img)) for img in imglist]
22         await asyncio.wait(tasks)
23 if __name__ == '__main__':
24     t1 = int(round(time.time()*1000))
25     asyncio.run(main())
26     t2 = int(round(time.time()*1000))
27     print('执行了{} 毫秒'.format(t2-t1))