大家帮我一下看一下怎样做

仅供参考

def main(num, decimal):
    mid = []
    while True:
        num, rem = divmod(num, decimal)
        mid.append(rem)
        if num == 0:
            break
    return ''.join([str(i) for i in mid[::-1]])

num = 30
decimal = 2
print(main(num, decimal))