卡普雷卡尔黑洞：验证有趣的数字现象

def kaprekar(num): if num == 0: return 0 digits = [] while num > 0: digits.append(num % 10) num //= 10 digits.sort() min_num = 0 for digit in digits: min_num = min_num * 10 + digit max_num = 0 for digit in reversed(digits): max_num = max_num * 10 + digit result = max_num - min_num if result == 0: return 0 else: return kaprekar(result) + 1

num = int(input('请输入一个4位数（除了4个数字都相同的数）：')) if num // 1111 == 1: print('输入错误') else: result = kaprekar(num) print('归敛结果为：6174，经过{}次卡普雷卡尔运算得到'.format(result))