我在pycharm上写的，说没有attribute to urlopen，什么意思呀？
我在pycharm上没有搜到urllib2，只有3，安装了3.
我照着写的，结果报错：
module 'urllib3' has no attribute 'urlopen'
还有就是cookielib我只找到了cookielib3,安装还老是报错：
Collecting cookielib3
Could not find a version that satisfies the requirement cookielib3 (from versions: )
No matching distribution found for cookielib3
You are using pip version 9.0.1, however version 9.0.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
但是我pip 9.0.2已经安装了，
大家有遇到这样的问题吗？
