from multiprocessing import Process

def doble(n):
    print('el doble de {} és {}'.format(n, n*2))

def triple(n):
    print('el triple de {} és {}'.format(n, n*3))

if __name__ == '__main__':
    procs = [Process(target=doble, args=(3,)),
             Process(target=triple, args=(4,))]
    for p in procs:
        p.start()
    for p in procs:
         p.join()