在安裝virtualenvwrapper 的時候，報錯了
sudo pip install virtualenvwrapper
Installing collected packages: six, pbr, stevedore, virtualenvwrapper
Found existing installation: six
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-:
Exception:
......
OSError: [Errno ] Operation not permitted: '/tmp/pip-edq21p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
後來知道，mac本身帶的python庫是有問題的，重新安裝下python，再安裝就行了
brew install python