matrix multiplication

def square_matrix(matrix1, matrix2):
    size = len(matrix1)

    product = [
        [0,0],
        [0,0]
    ]

    for i in range(size):
        for j in range(size):
            sum = 0
            for k in range(size):
                sum += matrix1[i][k] * matrix2[k][j]
            product[i][j] = sum

    return product

print(square_matrix(
    [[1,4],
    [7,5]],

    [[6,8],
    [3,2]]
))