title: ImportError: No module named mpl_toolkits
body: <p>I have a python program and am trying to plot something using the mplot3d from mpl toolkits,  but whenever I try to import the Axes3D from mpl_toolkits <code>from mpl_toolkits.mplot3d import Axes3D
  </code> I get the following error: <code>ImportError: No module named mpl_toolkits
  </code></p>