title: Plotting a 3d cube, a sphere and a vector in Matplotlib
body: <p>I search how to plot something with less instruction as possible with Matplotlib but I don't find any help for this in the documentation.</p>
  
  <p>I want to plot the following things:</p>
  
  <ul>
  <li>a wireframe cube centered in 0 with a side length of 2</li>
  <li>a "wireframe" sphere centered in 0 with a radius of 1</li>
  <li>a point at coordinates [0, 0, 0]</li>
  <li>a vector that starts at this point and goes to [1, 1, 1]</li>
  </ul>
  
  <p>How to do that?</p>