day4 使用xpath语法获取百度的‘百度一下’

from lxml import etree
import urllib.request

url = 'http://www.baidu.com/'

headers = {
    'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36 Edg/113.0.1774.42'
}
request = urllib.request.Request(url = url,headers = headers)
response = urllib.request.urlopen(request)
content = response.read().decode('utf-8')



#解析服务器响应的文件
tree = etree.HTML(content)
#xpath语法
result = tree.xpath('//input[@id="su"]/@value')[0]
print(result)

打印结果为 百度一下