爬虫初学04：下载器

from urllib import request
from multiprocessing import Process
import os

def downloader(url,**kwargs):
    print('当前进程id：',os.getpid(),os.getppid())

    print('关键字参数:',kwargs['pro'])

    #文件名
    file_name=url.split('/')[-1]

    #网络请求
    response=request.urlopen(url) #一个响应对象

    #获取相应的内容
    content=response.read()

    #保存
    with open(file_name,'wb') as fp:
        fp.write(content)

if __name__ == '__main__':
    # for i in range(1,5,1):
    #     url='http://www.langlang2017.com/img/banner'+str(i)+'.png'
    #     print(url)
    #     p=Process(target=doenloader,args=(url,))

    name_list=['进程1-蒋博文','进程2-少女周']
    url_list=['https://img.alicdn.com/imgextra/i1/55316976/O1CN01LaLGVN21P3SIS5uZZ_!!0-saturn_solar.jpg_220x220.jpg',
              'https://img.alicdn.com/imgextra/i2/122400877/O1CN01dpfo471ILhqr9u3Ic_!!0-saturn_solar.jpg_220x220.jpg'
    ]
    p_list=[]         #进程列表
    i=0
    for url in url_list:
        n=name_list[i]
        i+=1
        p=Process(target=downloader,name=n,args=(url,),kwargs={'pro':'最高等级'})
        print('当前子进程%s将要被运行:'%p.name)
        p.start()
        p_list.append(p)

    for p in p_list:
        p.join()


    print('主进程id:',os.getpid())

    #确保这句代码在所有子进程之后
    print('--------------------所有文件下载完成------------')