#?-*-?coding:utf-8?-*-
from?urllib?import?request
import?http.cookiejar

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

print("第一種方法")
response1?=?request.urlopen(url)
print(response1.getcode())
print(len(response1.read()))

print("第二種方法")
req=request.Request(url)
req.add_header("user-agent","Mpzilla/5.0")
response2=request.urlopen(req)
print(response2.getcode())
print(len(response2.read()))


print("第三種方法")
cj=http.cookiejar.CookieJar()
opener=request.build_opener(request.HTTPCookieProcessor(cj))
request.install_opener(opener)
response3=request.urlopen(url)
print(response3.getcode())
print(cj)
print(response3.read())

去掉最后一行代碼的結果是正常的