python：初学者友好，两种方法

解题思路:

注意事项:

参考代码:

#方法一

n = int(input())

total_sum = 0

for i in range(1, n + 1):

    if i % 7 == 0:

        continue

    num_str = str(i)

    if '7' in num_str:

        continue

    total_sum += i * i

print(total_sum)

#方法二：C语言思维比较严重

n = int(input())

mp = []

sum_square = 0

for i in range(1, n + 1):

    if i % 7 != 0:

        mp.append(i)

new_mp = []

for i in mp:

    b = i

    is_seven = False

    while b > 0:

        a = b % 10

        b //= 10

        if a == 7:

            is_seven = True

            break

    if not is_seven:

        new_mp.append(i)

for i in new_mp:

    sum_square += i * i

print(sum_square)