python 3.X系列报错：No module named 'urllib2'

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查阅Python官方文档里面已有说明：

Note The urllib2 module has been split across several modules in
Python 3.0 named urllib.request and urllib.error. The 2to3 tool will
automatically adapt imports when converting your sources to 3.0
from urllib.request
import urlopen
response = urlopen(“http://www.google.com”)
html = response.read()
print(html)

从这里可以看出，是由于python版本之间差异导致的，Python 3中urllib2用urllib.request替代
正确用法：

import urllib.request
resp=urllib.request.urlopen('http://www.baidu.com')
html=resp.read()
print(html)