python2环境：

import urllib urllib2

request = urllib2.Request('http://www.baidu.com')
request = urllib2.request('http://www.baidu.com')
request = urllib.Request('http://www.baidu.com')
request = urllib.request('http://www.baidu.com')  

python3环境：

import urllib urllib2

request = urllib.Request('http://www.baidu.com')
request = urllib.request('http://www.baidu.com')

以上全部报错AttributeError: 'module' object has no attribute 'Request'