When canopy visual environment has been installed, you might find your can't install Scipy to /usr/local/lib/python2.7/ anymore, or you might encounter pip "DistributionNotFound" Error. The solution is to reinstall python like this, using the soft way. Then pip install scipy.
Python package "intonation" needs Scipy.
Plot histogram of a recording object might cause float error in mac os backend. Try to use:
before import anything from pylab.