Numpy build fails with cannot import multiarray

on Mac:

1.) remove these 2 folders manually:

rm -rf /usr/local/lib/python2.7/site-packages/numpy/
rm -rf /usr/local/lib/python2.7/site-packages/numpy-1.10.4.dist-info/

notice: pip uninstall numpy didn't work for me, I had to remove numpy manually.

2.) re-install numpy: pip install numpy

This was solved by doing brew uninstall python, deleting the contents of /usr/local/lib/python2.7/site-packages, reinstalling python, and then rebuilding numpy.