combinations.py

def append(xs, yss):
    return [[x] + ys for x in xs for ys in yss]

def make_lists(*xss):
    if len(xss) == 1:
        return [[x] for x in xss[0]]
    h, t = xss[0], xss[1:]
    return append(h, make_lists(*t))


def main():
    xs = [0, 1, 2]
    ys = [4, 5]
    zs = [10, 20]
    print make_lists(xs, ys)
    print make_lists(xs, ys, zs)


if __name__ == '__main__':
    main()