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468.-validate-ip-address.md

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468. Validate IP Address

  • Medium

  • Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid IPv6 address or "Neither" if IP is not a correct IP of any type.

    A valid IPv4 address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi cannot contain leading zeros. For example, "192.168.1.1" and "192.168.1.0" are valid IPv4 addresses but "192.168.01.1", while "192.168.1.00" and "[email protected]" are invalid IPv4 addresses.

    A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:

    • 1 <= xi.length <= 4
    • xi is a hexadecimal string which may contain digits, lower-case English letter ('a' to 'f') and upper-case English letters ('A' to 'F').
    • Leading zeros are allowed in xi.

    For example, "2001:0db8:85a3:0000:0000:8a2e:0370:7334" and "2001:db8:85a3:0:0:8A2E:0370:7334" are valid IPv6 addresses, while "2001:0db8:85a3::8A2E:037j:7334" and "02001:0db8:85a3:0000:0000:8a2e:0370:7334" are invalid IPv6 addresses.

Analysis

Just do what we are told to do. 

class Solution:
    def validIPAddress(self, IP):

            def isIPv4(s):
                try: return str(int(s)) == s and 0 <= int(s) <= 255
                except: return False

            def isIPv6(s):
                try: return len(s) <= 4 and int(s, 16) >= 0
                except: return False

            if IP.count(".") == 3 and all(isIPv4(i) for i in IP.split(".")):
                return "IPv4"
            if IP.count(":") == 7 and all(isIPv6(i) for i in IP.split(":")):
                return "IPv6"
            return "Neither"