Python - ayuda para saber todas las sublistas de una lista.

def permutations(iterable, r=None):

    pool = tuple(iterable)

    n = len(pool)

    r = n if r is None else r

    if r > n:

        return

    indices = range(n)

    cycles = range(n, n-r, -1)

    yield tuple(pool[i] for i in indices[:r])

    while n:

        for i in reversed(range(r)):

            cycles[i] -= 1

            if cycles[i] == 0:

                indices[i:] = indices[i+1:] + indices[i:i+1]

                cycles[i] = n - i

            else:

                j = cycles[i]

                indices[i], indices[-j] = indices[-j], indices[i]

                yield tuple(pool[i] for i in indices[:r])

                break

        else:

            return