为什么CSV文件里面没东西啊也没有报错

import requests
from lxml import etree
import csv
from concurrent.futures import ThreadPoolExecutor
f = open("data.csv","w",encoding="utf-8")
csvwriter = csv.writer(f)
def download_page(url):
    reponse = requests.get(url).text
    tree = etree.HTML(reponse)
    cj_list = tree.xpath(".//table[@class='hq_table']")[0]
    trs = cj_list.xpath(".//table[@class='hq_table']/tbody/tr")[1:]
    # print(cj_list)
    for li in trs:
        cj_li = li.xpath(".//table[@class='hq_table']/tbody/tr/td/text()")
        # print(cj_li)
        cj_li = (item.replace("\\","").replace("/","") for item in cj_li)
        print(cj_li)
        csvwriter.writerow(cj_li)
    print(url,"下载完成！")
if __name__ == '__main__':
    with ThreadPoolExecutor(50) as t:
        for i in range(1,200):
            t.submit(download_page,f"http://www.xinfadi.com.cn/marketanalysis/0/list/{i}.shtml")

程序在对页面数据采集时, 没有采集到对应的数据导致的