[프로그래머스] 없는 숫자 더하기

문제

https://school.programmers.co.kr/learn/courses/30/lessons/86051

프로그래머스

 

def solution(numbers):
    index = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
    answer = []
    for number in index:
        if number not in numbers:
            answer.append(number)

    return sum(answer)