def human_years_cat_years_dog_years(human_years): if human_years == 1: return human_years, 15 / human_years, 15 / human_years elif human_years == 2: return human_years, 15 * human_years - 15 + 9, 15 * human_years - 15 + 9 elif human_years >= 3: humanYears = human_years catYears = (human_years - 2) * 4 + 15 * 2 - 15 + 9 dogYears = (human_years - 2) * 5 + 15 * 2 - 15 + 9 return [humanYears, catYears, dogYears] print(human_years_cat_years_dog_years(10))