Solution.py

class Solution:
    def validIPAddress(self, queryIP: str) -> str:
        def is_ipv4(s: str) -> bool:
            ss = s.split(".")
            if len(ss) != 4:
                return False
            for t in ss:
                if len(t) > 1 and t[0] == "0":
                    return False
                if not t.isdigit() or not 0 <= int(t) <= 255:
                    return False
            return True

        def is_ipv6(s: str) -> bool:
            ss = s.split(":")
            if len(ss) != 8:
                return False
            for t in ss:
                if not 1 <= len(t) <= 4:
                    return False
                if not all(c in "0123456789abcdefABCDEF" for c in t):
                    return False
            return True

        if is_ipv4(queryIP):
            return "IPv4"
        if is_ipv6(queryIP):
            return "IPv6"
        return "Neither"