List of preinstalled Python packages in Yosemite? I have installed many python packages via sudo pip install and some of them have messed up the system by overwriting or updating preloaded python packages. Now I want to revert all the damage done and install my own packages only in a virtualenv. Is there any way I can obtain a list of python packages, preferably with their version, that comes with a clean Yosemite?
pip (1.5.6)
setuptools (5.4.2)
wsgiref (0.1.2)


Yosemite 10.10.2