IP_validation.md

CodeWars Python Solutions

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IP Validation

Write an algorithm that will identify valid IPv4 addresses in dot-decimal format. IPs should be considered valid if they consist of four octets, with values between 0 and 255, inclusive.

Valid inputs examples:

Examples of valid inputs:
1.2.3.4
123.45.67.89

Invalid input examples:

1.2.3
1.2.3.4.5
123.456.78.90
123.045.067.089

Notes:

• Leading zeros (e.g. 01.02.03.04) are considered invalid
• Inputs are guaranteed to be a single string

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Given Code

def is_valid_IP(strng):
    return None

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Solution 1

def is_valid_IP(strng):
    try:
        formatted = [int(i.strip()) for i in strng.split(".") if 0 <= int(i) <= 255]
        if len(formatted) == 4 and ".".join([str(i) for i in formatted]) == strng:
            return True
        else:
            return False
    except:
        return False

Solution 2

from ipaddress import ip_address

def is_valid_IP(strng):
    try:
        return True if ip_address(strng) else False
    except:
        return False

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