def problem1(k, numbers): numberslen = len(numbers); for index1 in range(numberslen): number1 = numbers[index1]; for index2 in range(numberslen): if index1 == index2: continue; number2 = numbers[index2]; if number1 + number2 == k: return True; numbers = [10, 15, 3, 7]; print(problem1(17, numbers)); print(problem1(19, numbers)); print(problem1(10, numbers));