python爬虫得到的图片打不开

import requests
from lxml import etree
import os
url = 'https://pic.netbian.com/new/'

page_text = requests.get(url).content
tree = etree.HTML(page_text)
div_list = tree.xpath('//div[@class="slist"]/ul/li')
if not os.path.exists('upian'):
    os.mkdir('upian')
for img in div_list:
    src = 'https://pic.netbian.com/'+img.xpath('./a/@href')[0]

    name = img.xpath('./a/img/@alt')[0]+'.jpg'
    print(src,name)
    pic = requests.get(src).content
    tree2 = etree.HTML(pic)
    picurl = 'https://pic.netbian.com'+tree2.xpath('//*[@id="img"]/img/@src')[0]
    print(picurl)
    response = requests.get(picurl).content
    pic_path = 'upian/'+name

    with open(pic_path,'wb')as f:
        f.write(response)
        print(name,'done*****************')

不写绝对路径，默认是当前工作文件夹，所以直接加tupian,前面的./没毛用。
再有就是你把获取到的网址就当做图片的网址是不对的。页面里还有很多其他的照片，文字等等。真实地址要打开之后只能看到图片。