到这一步要怎么保存图片到本地文件

import requests
from lxml import etree
import os
url='https://www.jdlingyu.com/38203.html'
headers={
       'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36'
}
response=requests.get(url=url,headers=headers)
page= response.text
# print(html) //*[@id="primary-home"]/article/div[2]/p     
tree=etree.HTML(page)
li_list=tree.xpath('//div[@id="primary-home"]/article/div[2]')

for li in li_list:
      # name=li.xpath('./p/img/@loading="lazy"')   返回true
      img_data = li.xpath('./p/img/@src')

给你个例子，这个是我抓取图片存储的 

import requests
from urllib.request import urlretrieve
import re

# encoding: utf-8
"""
@version: 1.0
@author: AusKa_T
@file: ex_umei
@time: 2019/11/9 0009 10:42
"""


def download_images(url, regex):
    response = requests.get(url)
    response.encoding = response.apparent_encoding
    html = response.text
    img_details = re.findall(regex, html)
    for i, src in enumerate(img_details):
        savename = r'downloads/{}_{}.png'.format(i + 1, src[1])
        urlretrieve(src[0], savename)


if __name__ == '__main__':
    download_images('http://www.umei.cc/weimeitupian/oumeitupian/', r'<img src="(.*?)" width="180" height="270" /><span>(.*?)</span>')