new_contents: import threading
  
  def affiche(nb, nom = ''):
      for i in range(nb): print nom, i
  
  a = threading.Thread(None, affiche, None, (200,), {'nom':'thread a'})
  b = threading.Thread(None, affiche, None, (200,), {'nom':'thread b'})
  a.start()
  b.start()
  
subject: Add a test for the threading mechanism