显示的问题：

 File "E:\0602test\urllib2.py", line 6, in <module>

    response1 = urllib2.urlopen(url)

AttributeError: 'module' object has no attribute 'urlopen'

代码如下：

# -*- coding: utf-8 -*-
import urllib2
import cookielib
url = "http://www.baidu.com"
print "第一种方法"
response1 = urllib2.urlopen(url)
print response1.getcode()
print len(response1.read())

print "第二种方法"
request = urllib2.Request(url)
request.add_header("user-agent","Mozilla/5.0")
response2 = urllib2.urlopen(request)
print response2.getcode()
print len(response2.read())

print "第三种方法"
cj = cookielib.CookieJar()
opener = urllib.builb_opener(urllib2.HTTPCookieProcessor(cj))
urllib2.install_opener(opener)
response3 = urllib.urlopen(url)
print response3.getcode()
print cj
print len(response3.read())