爬虫部分数据写入excel失败

最近学习爬虫，参考大佬代码，但是爬取结果没有抬头，第三个爬取的数据并没有插入excel中

import requests
from lxml import etree
from openpyxl import Workbook
import random

class tengxun():
    def __int__(self):
        self.url = 'https://ke.qq.com/course/list?mt=1001&page={}'
        self.header = {
            "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0",
            "Connection": "keep - alive",
        }
        self.wb = Workbook()
        self.ws = self.wb.active
        self.ws.append(['title', 'link', 'now_reader'])

    def geturl(self):
        self.url = 'https://ke.qq.com/course/list?mt=1001&page={}'
        url = [self.url.format(i) for i in range(1,5)]
        return url

    def prase_url(self,url):
        self.header = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0",
            "Connection": "keep - alive",
        }
        response = requests.get(url, headers=self.header, timeout=5)
        return response.content.decode('gbk', 'ignore')

    def get_list(self,html_str):
        html = etree.HTML(html_str)
        connect_list = []
        lists = html.xpath("//li[@class ='course-card-item']")
        for list in lists:
             item = {}
             item['title'] = ''.join(list.xpath("./h4/a[@class = 'item-tt-link']/text()"))
             item['link'] = ''.join(list.xpath("./a[@class = 'item-img-link']/@href"))
             item['now_reader'] = ''.join(list.xpath("./div[@class = 'item-line item-line--moddle']/span[@class='line-cell item-user']/text()"))
             connect_list.append(item)
        return connect_list

    def save_list(self, connects):
        self.wb = Workbook()

        self.ws = self.wb.active

        for connect in connects:
            self.ws.append([connect['title'], connect['link'], connect['now_reader']])
        print('保存成功页招聘信息')

    def run(self):
        url_list = self.geturl()
        for url in url_list:
            html_url = self.prase_url(url)
            connects = self.get_list(html_url)
            self.save_list(connects)
        self.wb.save(r'C:\Users\Administrator\Desktop\resource\UA_ls\demo_09 try.xlsx')

if __name__=='__main__':
    spider = tengxun()
    spider.run()

item-line item-line--moddle => item-line item-line--middle
但是数据还是不全，我也没办法了

不明所以，问问题把问题描述的详细一些 可以让人快速的看懂贴一堆代码出来 很少有人会去运行