python爬虫下载验证码或附件的方法

下边的是下载京东验证码的方法，一些方法给记录一下：      

   url='https://mall.jd.com/sys/vc/createVerifyCode.html?random='+str(random.random())
   img = requests.get(url)
   if img.status_code==200:
       imgname = 'jd/' + str(i)+'.jpg'
       print('下载图片'+imgname)
       with open(imgname, 'wb') as fd:
            fd.write(img.content)