Installing collected packages: six
Found existing installation: six 1.4.1
DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project. Uninstalling six-1.4.1:
把安装的命令改成
sudo pip install six --upgrade --ignore-installed six
Cannot uninstall ‘requests‘. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
把安装的命令改成
sudo pip install requests --upgrade
Pip安装依赖于six、requests库失败的解决方法
原文：http://blog.51cto.com/lizhiyuan/2121489
