from multiprocessing import Process, Pipe

def fill(conn):
    conn.send([12, 0.5, 'un string', [1,2,3]])
    conn.close()

if __name__ == '__main__':
    connexioPare, connexioFill = Pipe()
    p = Process(target=fill, args=(connexioFill,))
    p.start()
    print(connexioPare.recv())
    p.join()