导入自写的模块时，遇到问题

今天测试自己写的模块，在大部分地方成功运行，可是到了壁纸的网站就失败了
url='https://wallhaven.cc/toplist?page= 2‘
模块主程序：

import requests
from lxml import etree
import os
import time

def coffee_dou_requests(m,u,i,p,j):
    start = time.time()
    for mima in range(5):
        if m == 'qazplm75124':
            break
        else:
            print("密码错误")
            exit('')
    for c in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19',
              '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31', '32', '33']:
        url = u
        headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36'
        }
        b = '.jpg'
        a = int(0)
        response = requests.get(url=url, headers=headers)
        page_text = response.text
        tree = etree.HTML(page_text)
        li_list = tree.xpath(i)
        if not os.path.exists(f'./{p}'):
            os.mkdir(f'./{p}')
        for li in li_list:
            a = a+1
            u = li.xpath(f'{j}')[0]
            img_name = (f'{a}+{b}')
            # img_name = img_name.encode('iso-8859-1').decode('gbk')
            img_data = requests.get(url=u, headers=headers).content
            img_path = f'{p}/' + img_name
            with open(img_path, 'wb') as fp:
                fp.write(img_data)
            print(img_name, u, '爬取完毕！！')
            end = time.time()
            print('总耗时:', end - start)
    print("爬取结束！！！")
    return a

#u为url
#i为宏观位置
#p为文件名称
#j为具体位置

程序部分：

from coffee_dou_requests import coffee_dou_requests
#import asyncio
#u=input("请输入url或url格式:")
#i=input("请输入宏观位置(类型为xpath)：")
#p=input("请输入文件名称：")
#j=input("请输入爬取内容具体位置(类型为xpath)：")
m=input("请输密码:")



u = 'https://wallhaven.cc/toplist?' + 'page=' + "2"
i = '//*[@id="thumbs"]/section[1]/ul/li//a/@href'
p = "壁纸"
j = '//img[@id="wallpaper"]/@src'
u = coffee_dou_requests(m, u, i, p, j)
print(u)


#密码为：qazplm75124

报错为：

Traceback (most recent call last):
  File "C:/Users/16662/Desktop/555.py", line 15, in <module>
    u = coffee_dou_requests(m, u, i, p, j)
  File "C:\Users\16662\Desktop\coffee_dou_requests.py", line 30, in coffee_dou_requests
    u = li.xpath(f'{j}')[0]
AttributeError: 'lxml.etree._ElementUnicodeResult' object has no attribute 'xpath'

在测试其他的网站时，程序成功运行，可到了这个就报错
相关模块代码禁止转载，如需，请联系作者

这个网站可能是动态传输，所以爬不到数据