Python | Leetcode Python题解之第482题秘钥格式化
题目：
题解：
class Solution:
def licenseKeyFormatting(self, s: str, k: int) -> str:
ans = list()
cnt = 0
for i in range(len(s) - 1, -1, -1):
if s[i] != "-":
ans.append(s[i].upper())
cnt += 1
if cnt % k == 0:
ans.append("-")
if ans and ans[-1] == "-":
ans.pop()
return "".join(ans[::-1])