new_contents: # from http://www.labri.fr/perso/nrougier/teaching/matplotlib/
  
  from pylab import*
  
  X = np.linspace(-np.pi, np.pi, 256,endpoint=True)
  C,S = np.cos(X), np.sin(X)
  
  plot(X,C)
  plot(X,S)
  
  show()
  
subject: Add another, simpler, matplotlib example