python urllib访问网站

from urllib.request import urlopen
from urllib.parse import urlencode
import re
wd='python'
wd=urlencode({"wd":wd})
url="http://www.baidu.com/s?"+wd
page=urlopen(url).read()
content=(page.decode("utf-8")).replace("\n","").replace("\t","")
r=re.compile('href="http:.+">')
data=r.findall(content)
print(data)