ContextQMD
Back to Freecodecamp

Challenge 26: IPv4 Validator

curriculum/challenges/english/blocks/daily-coding-challenges-python/68adce01c0e1144d0a902958.md

latest2.1 KB
Original Source

--description--

Given a string, determine if it is a valid IPv4 Address. A valid IPv4 address consists of four integer numbers separated by dots (.). Each number must satisfy the following conditions:

  • It is between 0 and 255 inclusive.
  • It does not have leading zeros (e.g. 0 is allowed, 01 is not).
  • Only numeric characters are allowed.

--hints--

is_valid_ipv4("192.168.1.1") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("192.168.1.1"), True)`)
}})

is_valid_ipv4("0.0.0.0") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("0.0.0.0"), True)`)
}})

is_valid_ipv4("255.01.50.111") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("255.01.50.111"), False)`)
}})

is_valid_ipv4("255.00.50.111") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("255.00.50.111"), False)`)
}})

is_valid_ipv4("256.101.50.115") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("256.101.50.115"), False)`)
}})

is_valid_ipv4("192.168.101.") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("192.168.101."), False)`)
}})

is_valid_ipv4("192168145213") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_ipv4("192168145213"), False)`)
}})

--seed--

--seed-contents--

py
def is_valid_ipv4(ipv4):

    return ipv4

--solutions--

py
def is_valid_ipv4(ipv4):
    parts = ipv4.split(".")    

    if len(parts) != 4:
        return False

    for part in parts:
        if not part.isdigit():
            return False

        num = int(part)
        if num < 0 or num > 255:
            return False

        if len(part) > 1 and part.startswith("0"):
            return False

    return True