2022/3/27 lmxl练习

from lxml import etree
import urllib.request
url="https://www.baidu.com"
headers={
'user-agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36'
}
request=urllib.request.Request(url=url,headers=headers)
response= urllib.request.urlopen(request)
content= response.read().decode('utf-8')
# print(content)
tree=etree.HTML(content)
result=tree.xpath('//input[@id="su"]/@value')[0]
print(result)