【Day3】项目实战。百度针对Xpath的反爬策略和解决方式

import lxml.etree as le
with open('edu.html','r',encoding='utf-8') as f:
    html = f.read()
    html_x = le.HTML(html)
    a_x_s = html_x.xpath("//div[contains(@class,'threadlist_title pull_left j_th_tit')]/a/text()")
    for a in a_x_s:
        print(a)

如果HTML被注释，Xpath会不起作用，此时应该使用正则表达式

import re
with open('edu.html','r',encoding='utf-8') as f:
    html = re.sub('\n','',f.read())
    a_pattern = '<div class="threadlist_title pull_left j_th_tit ">.*?<a.*?>(.*?)</a>'
    a_s = re.findall(a_pattern,html)
    for a in a_s:
        print(a)