facerec is a facial recognition/identification library from OpenCV. It has a Python binding already built in, and is capable to recognizing multiple faces.
$ git clone https://github.com/bytefish/facerec.git
Build and Install
$ sudo python setup.py install
This installs facerec python modules in
/usr/local/lib/python2.7/dist-packages/facerec. To use it, be sure your
PYTHONPATH includes this path.
The main facerec demo is