网址：https://movie.douban.com/

import requests
from lxml import etree
import re
url = 'https://movie.douban.com'
headers = {
    'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.289 Safari/537.36'
}
session = requests.session()
response = session.get(url,headers = headers)
# response.encoding='utf-8'
# response.encoding = response.apparent_encoding
index_url = 'https://movie.douban.com'
res = session.get(index_url,headers=headers)
# print(res.text)
# 输出：页面源代码
tree = etree.HTML(res.text)
# print(tree)
# 输出：<Element html at 0x186fa6a3100>
img_all = tree.xpath('//img')
# print(img_all)
for i in img_all:
    img = etree.tostring(i, encoding='UTF-8').decode('UTF-8')
    # 得到所有的img标签
    # print(img)
    # <img src="https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2900931370.jpg" alt="&#x5C0F;&#x884C;&#x661F;&#x730E;&#x4EBA;" rel="nofollow" class=""/>
    img_url = tree.xpath('//img/@src')
    # img_name = tree.xpath('//img/@alt')
    # print(img_url,img_name)
    # 输出：许多个列表
    for i in img_url:
        # print(i)
        last_str = i.split('/')[-1]
        # print(last_str)
        # 输出：多个p2900931370.jpg  p2901057189.jpg
        every_name = last_str.split('.')[0]
        # print(every_name)
        # 输出：多个p2900931370  p2901057189
        res_url = session.get(i,headers=headers)
        with open(f'./img/{every_name}.jpg','wb') as f:
            f.write(res_url.content)

运行结果：