[Python] Python IPv4 Validation Only Checking First Byte Instead of All Four Bytes

I'm writing a Python function to validate IPv4 addresses. for a Task of CS50 Python. My function should:

Ensure the format is X.X.X.X, where each X is a number between 0-255. Return True for valid IPv4 addresses and False otherwise.

However, my test case is failing with this error message:

test_numb3rs.py catches numb3rs.py only checking if first byte of IPv4 address is in range**


check50 error

my main code is:

import re

def main():
print(validate(input("IPv4 Address: ")))

def validate(ip):
match = re.fullmatch(r"(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})", ip)
return bool(match) and all(0 <= int(octet) <= 255 for octet in match.groups())

if __name__ == "__main__":
main()



and my Test Code is:

from numb3rs import validate
def test_validate():
# Valid cases
assert validate("127.0.0.1") == True
assert validate("255.255.255.255") == True

# Invalid cases
assert validate("512.512.512.512") == False
assert validate("1.2.3.1000") == False
assert validate("cat") == False



I have tried following multiple solutions available but still could not understand the issue. I Tried using exit(1) in a different version of my code, but that also did not solve the issue. Instead, it made the cases where any one octet goes above 255 fail.

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