For those who don't know which site-packages folder is active in your system, you must consider how your system is configured. Especially if you're using HomeBrew kinda tool and installed python that way, your default site-packages folder that is shipped with OS X might have changed.
Anyways, the best way to learn what's your active site-packages folder is to type following in the python REPL:
from distutils.sysconfig import get_python_lib; print get_python_lib()
Or you could just write following in the terminal:
python -m site --user-site