python xpath

//img/@src 得到所有img标签的src值

//a/text() 得到所有A标签中的文本

name=response.xpath('//img@src').getall()  #getall（）从对象中获取具体值

import requests,re
from lxml import etree
import json,sys
url1="http://tieba.baidu.com/f?kw=%E6%AD%A6%E6%B1%89&red_tag=d3345989481"
html=requests.get(url1)
select=etree.HTML(html.text)
quyu=select.xpath('//li[@class=" j_thread_list clearfix"]')
#print(quyu)
for each in quyu:
    auth=json.loads(each.xpath('@data-field')[0])
    author=auth['author_name']
    id=auth['id']
    #print(type(auth))
    print(author,id)

结果：

==================== RESTART: D:/Python/Python37/tieba.py ====================

silent烟花 6496741920

silent烟花 6497028530

silent烟花 6497025455

silent烟花 6497024605

silent烟花 6497012358

silent烟花 6497001415

silent烟花 6496980363

silent烟花 6496995996

silent烟花 6496995111

silent烟花 6496994178

贴吧官方 6496068827