@wence- is right, it's the nasty `easy-install.pth` files created by distutils. Unfortunately it's even worse: you would have to edit `/usr/local/lib/python2.7/site-packages/easy-install.pth` with [a script like this](http://stackoverflow.com/a/5987359) to [get rid of the evil](http://stackoverflow.com/a/9588902) `import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert = p+len(new)`.