[프로그래머스] 행렬의 곱셈

def solution(arr1, arr2):
    answer = []
    for i in arr1:
        x = []
        for k in range(len(arr2[0])):
            n = 0
            for j in enumerate(arr2):
                n += i[j[0]] * j[1][k]
            x.append(n)
        answer.append(x)
           
    return answer