可以直接使用
#!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 #需求：解析下载图片数据 http://pic.netbian.com/4kmeinv/
 4 import requests
 5 from lxml import etree
 6 import os
 7 if __name__ == "__main__":
 8 
 9     url = 'https://pic.netbian.com/4kmeinv/index_%d.html'
10     headers = {
11         'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36'
12     }
13 
14     for n in range(1,150):
15         new_url = format(url%n)
16         print(new_url)
17         response = requests.get(url=new_url,headers=headers)
18         #手动设定响应数据的编码格式
19         # response.encoding = 'utf-8'
20         page_text = response.text
21 
22         #数据解析：src的属性值  alt属性
23         tree = etree.HTML(page_text)
24         li_list = tree.xpath('//div[@class="slist"]/ul/li')
25 
26 
27         #创建一个文件夹
28         if not os.path.exists('./picLibs'):
29             os.mkdir('./picLibs')
30 
31         for li in li_list:
32             img_src = 'http://pic.netbian.com'+li.xpath('./a/img/@src')[0]
33             img_name = li.xpath('./a/img/@alt')[0]+'.jpg'
34             #通用处理中文乱码的解决方案
35             img_name = img_name.encode('iso-8859-1').decode('gbk')
36 
37             # print(img_name,img_src)
38             #请求图片进行持久化存储
39             img_data = requests.get(url=img_src,headers=headers).content
40             img_path = f'picLibs/{n}'+img_name
41             with open(img_path,'wb') as fp:
42                 fp.write(img_data)
43                 print(img_name,'下载成功！！！')