为什么我照老师的敲的，版本是2.7的，运行程序后报错

#-*-coding:utf8 -*-

import urllib

import urllib2

url='http:reg.haibian.com/login/ajax_login'

#定义请求数据，并且对数据进行赋值

data={}

data['loginname']='student08@qq.com'

data['password']='96e79218965eb72c92a549dd5a330112'

#对请求数据进行编码

data=urllib.urlencode(data)

#将数据和url进行连接

request=url+'?'+data

requestResponse=urllib2.urlopen(request)

Responsestr=requestResponse.read()

print(requestResponse)

为什么我照老师的敲的，版本是2.7的，运行程序后报这个：

Traceback (most recent call last):

  File "E:/Python文本程序/get.py", line 14, in <module>

    requestResponse=urllib2.urlopen(request)

  File "C:\Python27\lib\urllib2.py", line 154, in urlopen

    return opener.open(url, data, timeout)

  File "C:\Python27\lib\urllib2.py", line 427, in open

    req = meth(req)

  File "C:\Python27\lib\urllib2.py", line 1126, in do_request_

    raise URLError('no host given')

URLError: <urlopen error no host given>