title: matplotlib: change axis orientation
body: <p>I used matplotlib to plot a 3d figure </p>
  
  <pre><code>def showlab(dic, title): 
      global driehoeken
      fig = plt.figure() 
      ax = fig.add_subplot(111, projection = '3d') 
      lijst = np.array(driehoeken)
      lijst = np.around(lijst, 2)
      poly3d = [[lijst[i, j*3:j*3+3]for j in range(3)]for i in range(lijst.shape[0])]
      ax.add_collection3d(Poly3DCollection(poly3d, linewidth = 1)) 
      ax.set_xlim(0, 100) 
      ax.set_xlabel('l') 
      ax.set_ylim(-150, 150) 
      ax.set_ylabel('a')
      ax.set_zlim(-150, 150)
      ax.set_zlabel('b') 
      plt.title(title)
      plt.show()
  </code></pre>
  
  <p>This plot a figure with the 'b' axis pointed upwards. But I want to have the 'l' axis pointed upwards, but keep the right hand rule. Is there a easy way to do this? </p>