Fwiw, I can not reproduce this with pyhon2,3 with or without virtualenv. "sudo pip install enum34" (as a example) installs into /usr/local/lib/python2.7/dist-package, but not in the system /usr/lib/python2.7/dist-packages dir. Same for sudo pip3 install enum34 (/usr/local/lib/python3.4/dist-packages).
Fwiw, I can not reproduce this with pyhon2,3 with or without virtualenv. "sudo pip install enum34" (as a example) installs into /usr/local/ lib/python2. 7/dist- package, but not in the system /usr/lib/ python2. 7/dist- packages dir. Same for sudo pip3 install enum34 (/usr/local/ lib/python3. 4/dist- packages) .
Help how to reproduce this would be appreciated.