并发下载多文件

main
    1.定义下载的文件路径
    2.调用执行下载的方法

download
    1.根据url地址请求网络资源
    2.在本地创建文件
    3.读取网络资源并写入到本地文件
    4.处理异常

---

from gevent import monkey
monkey.patch_all()

import urllib.request
import gevent


def download_img(img_url,file_name):
    try:
        # 根据url地址请求网络资源
        response_data = urllib.request.urlopen(img_url)
        # 在本地创建文件
        with open('download/'+file_name,'wb') as f:
            print(f'开始下载：{file_name}')
            # 读取网络资源并写入到本地文件
            while True:
                file_data = response_data.read(409600)
                if not file_data:
                    break
                f.write(file_data)
    # 处理异常
    except Exception as e:
        print(f'下载发生错误：{file_name}:{e}')
    else:
        print(f'下载成功：{file_name}')


def main():
    # 定义下载的文件路径
    img_url1 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20200609/2/10/2208x1242.jpg'
    img_url2 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20181120/7/2208x1242.jpg'
    img_url3 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20181120/1/2208x1242.jpg'
    img_url4 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20190705/11/2208x1242.jpg'
    img_url5 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20200609/1/2/2208x1242.jpg'
    img_url6 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20200729/10/2208x1242.jpg'
    img_url7 = 'https://yys.res.netease.com/pc/zt/20170731172708/data/picture/20200628/6/2208x1242.jpg'

    # 调用执行下载的方法
    # download_img(img_url1,'1.jpg')
    gevent.joinall([
        gevent.spawn(download_img, img_url1, '1.jpg'),
        gevent.spawn(download_img, img_url2, '2.jpg'),
        gevent.spawn(download_img, img_url3, '3.jpg'),
        gevent.spawn(download_img, img_url4, '4.jpg'),
        gevent.spawn(download_img, img_url5, '5.jpg'),
        gevent.spawn(download_img, img_url6, '6.jpg'),
        gevent.spawn(download_img, img_url7, '7.jpg'),
    ])


if __name__ == '__main__':
    main()