uk_rock_stars = [1, 2, 3, 4, 5, 6, 7, 8, 9]
uk_pop_stars = [10, 11, 12, 13, 1, 4, 6, 22, 81]
us_stars = [22, 34, 44, 7, 33, 99, 22, 77, 99]
for combination in itertools.product(uk_rock_stars, uk_pop_stars, us_stars):
    pass
выбирать комбинации из нескольких списков