Calling Python from within Matlab

I was just playing around with the python py import within MATLAB. Should this work? The problem is with the plt.show() command. Other lines seem fine. No real reason why I would want to do this, just interested.

plt = py.importlib.import_module('matplotlib.pyplot');

plt.plot([1, 2, 3, 4]);

% plt.show(); % CRASHES MATLAB

plt.savefig('test.pdf', pyargs('dpi', 100, 'facecolor', 'b')); % WORKS

Mac OS 10.10.4 Matlab 2015a