Validate IP Address [LeetCode 468]

ValidIP.py

import re

class Solution:
    def validIPAddress(self, queryIP: str) -> str:
        
        def is_ipv4(ip: str) -> bool:
            
            ip = ip.split(".")
            
            if len(ip) == 4: # must have 4 different parts
                
                # For each part
                for part in ip:
                    if not (0 < len(part) <= 3): # length between 1 and 3 
                        return False
                    elif part != "0" and re.match(r"0{1,}", part): # no trailing zeros
                        return False
                    elif re.search(r"[a-zA-Z]", part): # not alphabets present
                        return False
                    elif not (0 <= int(part) <= 255): # between 0 and 255
                        return False
                    else:
                        pass
                return True
            
            return False
        
        def is_ipv6(ip: str) -> bool:
            
            ip = ip.split(":")
            
            if len(ip) == 8: # must have 8 different parts
                
                # For each part
                for part in ip:
                    if not (0 < len(part) <= 4): # length between 1 and 4
                        return False
                    elif re.search(r"[g-zG-Z]", part): # no alphabets except a to f or A to F
                        return False
                    else:
                        pass
                return True
            
            return False
       
        # Main logic
        if is_ipv4(queryIP):
            return "IPv4"
        elif is_ipv6(queryIP):
            return "IPv6"
        else:
            return "Neither"