first_norepeat_num.py

import unittest
import random


def is_repeat(n):
    n_str = str(n)
    for i in range(len(n_str) - 1):
        if n_str[i] == n_str[i + 1]:
            return False
    return True


def firstnum(n):
    while True:
        n += 1
        if is_repeat(n):
            return n
    return None


class FirstNumTest(unittest.TestCase):
    def test_first_num(self):
        n = 889911
        next_n = 890101
        res = firstnum(n)
        self.assertEqual(res, next_n)


if __name__ == '__main__':
    unittest.main()

找到第一个不重复的数字。