from multiprocessing import Process, Manager

def worker(x, i, *args):
    sub_l = x[i]
    sub_l[i] = i
    x[i] = sub_l


if __name__ == '__main__':
    manager = Manager()
    num = 4
    x = manager.list([{}]*num)
    p = []
    for i in range(num):
        p.append(Process(target=worker, args=(x, i)))
        p[i].start()

    for i in range(5):
        p[i].join()

    print x

sub_l = x[i]
sub_l[i] = sub_l[i] + <something unique to the worker>
x[i] = sub_l