【Python 3.x】urllib.request下载网页的三种方法

import urllib.request
import http.cookiejarurl = "http://www.baidu.com"response1 = urllib.request.urlopen(url)
#打印请求的状态码
print(response1.getcode())
#打印请求的网页内容的长度
print(len(response1.read()))request = urllib.request.Request(url)
request.add_header("user-agent","Mozilla/5.0")
response2 = urllib.request.urlopen(request)
print(response2.getcode())
print(len(response2.read()))cj = http.cookiejar.CookieJar()
opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
urllib.request.install_opener(opener)
response3 = urllib.request.urlopen(url)
print(response3.getcode())
print(len(response3.read()))
print(cj)
print(response3.read())