import urllib.request;

import http.cookiejar;

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

print("there are three methods to get url.")

print("first");

response1 = urllib.request.urlopen(url);

print(response1.getcode());

# 200 表示获取url地址成功

print(len(response1.read()));# 打印长度

#print("多行注释");

print("second");

request = urllib.request(url);

request.add_header("user_agent" , "Mozilla/5.0");

response2 = urllib.request.urlopen(request);

print(response2.getcode());

print(len(response2.read()));

# print("单行注释");

print("third");

'''

cj = http.cookiejar();

opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj));

urllib.request.install_opener(opener);

response3 = urllib.request.urlopen(url);

print(response3.getcode());

print(cj);

print(len(response3.read()));

'''