468. Validate IP Address 验证IP地址

【LeetCode】468. Validate IP Address 解题报告(Python)

标签(空格分隔): LeetCode

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/



Write a function to check whether an input string is a valid IPv4 address or IPv6 address or neither.

IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots ("."), e.g.,;

Besides, leading zeros in the IPv4 is invalid. For example, the address is invalid.

IPv6 addresses are represented as eight groups of four hexadecimal digits, each group representing 16 bits. The groups are separated by colons ("😊. For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is a valid one. Also, we could omit some leading zeros among four hexadecimal digits and some low-case characters in the address to upper-case ones, so 2001:db8:85a3:0:0:8A2E:0370:7334 is also a valid IPv6 address(Omit leading zeros and using upper cases).

However, we don't replace a consecutive group of zero value with a single empty group using two consecutive colons (:😃 to pursue simplicity. For example, 2001:0db8:85a3::8A2E:0370:7334 is an invalid IPv6 address.

Besides, extra leading zeros in the IPv6 is also invalid. For example, the address 02001:0db8:85a3:0000:0000:8a2e:0370:7334 is invalid.

Note: You may assume there is no extra space or special characters in the input string.

Example 1:

Input: ""

Output: "IPv4"

Explanation: This is a valid IPv4 address, return "IPv4".

Example 2:

Input: "2001:0db8:85a3:0:0:8A2E:0370:7334"

Output: "IPv6"

Explanation: This is a valid IPv6 address, return "IPv6".

Example 3:

Input: ""

Output: "Neither"

Explanation: This is neither a IPv4 address nor a IPv6 address.







class Solution(object):
    def validIPAddress(self, IP):
        :type IP: str
        :rtype: str
        if '.' in IP and self.checkIPv4(IP):
            return "IPv4"
        elif ':' in IP and self.checkIPv6(IP):
            return "IPv6"
            return "Neither"
    def checkIPv4(self, IP):
        numbers = IP.split('.')
        if len(numbers) != 4: return False
        for num in numbers:
            if not num or (not num.isdecimal()) or (num[0] == '0' and len(num) != 1) or int(num) > 255:
                return False
        return True
    def checkIPv6(self, IP):
        IP = IP.lower()
        valid16 = "0123456789abcdef"
        if "::" in IP: return False
        numbers = IP.split(':')
        if len(numbers) > 8: return False
        for num in numbers:
            if not num: continue
            if len(num) >= 5: return False
            for n in num:
                if n not in valid16:
                    return False
        return True


2018 年 6 月 13 日 ———— 腾讯赛圆满结束!两个月修得正果哈哈~~