请教uu为什么运行不报错，但是存入的文本没内容

Question

import requests
import pymysql
from lxml import etree
import openpyxl


if __name__ == '__main__':
    url = 'https://tianqi.2345.com/'

    # fd.write('日期,时间,温度,天气,风向,风级\n')

    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36'}
    res = requests.get(url=url, headers=headers).text
    tree = etree.HTML(res)
    div = tree.xpath('//div[@class="banner-right-canvas-kq-i clearfix"]/span')
    fd = open('weather_data.txt', 'w', encoding='utf8')
    for num in div:
        quality = num.xpath('./i/text()')[0]
        print(quality)
        #print(div)
        fd.write(quality)

Answer 1

因为页面上的数据是通过接口异步获取的，在你拿到的页面中根本没有天气数据，所以你定位页面元素拿到的div列表是空的。