链接
https://leetcode.cn/problems/license-key-formatting/description/
思路
字符串处理，没啥好说的...
代码
class Solution: def licenseKeyFormatting(self, s: str, k: int) -> str: valid_len, valid_s = self.get_length(s) first_len = valid_len % k if valid_len % k != 0 else k res = valid_s[:first_len] for i in range(first_len, valid_len, k): res += '-' + valid_s[i: i+k] return res def get_length(self, s): res = 0 res_s = '' for i in s: if i != '-': res += 1 res_s += i.upper() return res, res_s