python 基于协程下载图片（asyncio）

概述#!/usr/bin/envpythonimportdatetimeimportaiohttpimportasyncio#异步asyncdeffetch(session,url):print("发送请求：",url)asyncwithsession.get(url,verify_ssl=False)asresponse:content=awaitresponse.content.read()

#!/usr/bin/env pythonimport datetimeimport aiohttpimport asyncio# 异步async def fetch(session, url):    print("发送请求：", url)    async with session.get(url, verify_ssl=False) as response:        content = await response.content.read()        file_name = url.rsplit('=')[-1]        with open(file_name, mode='wb') as file_object:            file_object.write(content)        print("下载完成", url)async def main():    async with aiohttp.ClIEntSession() as session:        url_List = [            'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3228549874,2173006364&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1485012388,2380514454&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1280325423,1024589167&fm=26&gp=0.jpg',            'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1986451467,394304688&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=3880341262,3308316348&fm=26&gp=0.jpg',            'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3206689113,2237998950&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1999921673,816131569&fm=26&gp=0.jpg',            'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2583035764,1571388243&fm=26&gp=0.jpg',            'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3566088443,3713209594&fm=26&gp=0.jpg',            'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=507575223,907330772&fm=26&gp=0.jpg',            'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3681880960,455182084&fm=26&gp=0.jpg',            'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3223779882,3129702493&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1246451335,909670857&fm=26&gp=0.jpg',            'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1522015854,2481348088&fm=26&gp=0.jpg',            'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2837693275,770955883&fm=26&gp=0.jpg',            'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1552305556,735845065&fm=26&gp=0.jpg',            'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1082140274,3811265015&fm=26&gp=0.jpg'        ]        tasks = [asyncio.create_task(fetch(session, url)) for url in url_List]        await asyncio.wait(tasks)if __name__ == '__main__':    start_time = datetime.datetime.Now()    asyncio.run(main())    end_time = datetime.datetime.Now()    print("总共耗时：",end_time - start_time)

 

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#!/usr/bin/env pythonimport datetimeimport requestsdef download_image(url):  # 同步    print("开始下载：", url)    response = requests.get(url)    print("下载完成")    # 图片保存到本地    file_name = url.rsplit(',')[-1]    with open(file_name, mode='wb') as file_object:        file_object.write(response.content)if __name__ == '__main__':    url_List = [        'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3228549874,2173006364&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1485012388,2380514454&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1280325423,1024589167&fm=26&gp=0.jpg',        'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1986451467,394304688&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=3880341262,3308316348&fm=26&gp=0.jpg',        'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3206689113,2237998950&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1999921673,816131569&fm=26&gp=0.jpg',        'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2583035764,1571388243&fm=26&gp=0.jpg',        'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3566088443,3713209594&fm=26&gp=0.jpg',        'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=507575223,907330772&fm=26&gp=0.jpg',        'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3681880960,455182084&fm=26&gp=0.jpg',        'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3223779882,3129702493&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1246451335,909670857&fm=26&gp=0.jpg',        'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1522015854,2481348088&fm=26&gp=0.jpg',        'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2837693275,770955883&fm=26&gp=0.jpg',        'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1552305556,735845065&fm=26&gp=0.jpg',        'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1082140274,3811265015&fm=26&gp=0.jpg'    ]    start_time = datetime.datetime.Now()    for i in url_List:        download_image(i)    end_time = datetime.datetime.Now()    print("总共耗时：", end_time - start_time)

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