check50 expects exit code 0 not 1 in numb3rs.py

Question

The problem I'm trying is cs50's introduction to programming with python problem set 7 numb3rs problem, wherein I need to check if the Ip address entered is a valid Ip address or not. The thing is check50 gives me three error messages that I do not understand. These are the three errors:

:( correct numb3rs.py passes all test_numb3rs.py checks
    expected exit code 0, not 1
:| test_numb3rs.py catches numb3rs.py only checking if first byte of IPv4 address is in range
    can't check until a frown turns upside down
:| test_numb3rs.py catches numb3rs.py accepting expecting five-byte IPv4 address
    can't check until a frown turns upside down

import re

def main():

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

def validate(ip):
    address = "(0|[1-9]|[1-9][0-9]|[1-2][0-5][0-5]|1[0-9][0-9]|2[0-4][0-9])"
    if re.search(fr'^{address}\.{address}\.{address}\.{address}$', ip):
        return "True"
    else:
        return "False"

if __name__ == "__main__":
    main()

This is the code. I tried using sys to exit the program after print but that does not work. I also tried returning True and False as bools but that also didn't work. I also did a test_numb3rs.py as the problem asked for it and checked everything(All bytes, if user input was not an Ip address, and so on).

Answer 1

here are my codes, and i pass all the tests:

 import re


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


 def validate(ip):

if re.search(r"^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$", ip):
    list_of_numbers = ip.split(".")
    for number in list_of_numbers:
        if int(number) < 0 or int(number) > 255:
            return False
    return True
else:
    return False



  if __name__ == "__main__":
    main()

and the test_numb3rs.py:

  from numb3rs import validate

    def main():
     test_format()
     test_range()


  def test_format():
      assert validate(r"1.2.3.4")==True
      assert validate(r"1.2.3")==False
      assert validate(r"1.2")==False
      assert validate(r"1")==False

  def test_range():
      assert validate(r"255.255.255.255")==True
      assert validate(r"512.1.1.1")==False
      assert validate(r"1.512.1.1")==False
      assert validate(r"1.1.512.1")==False
      assert validate(r"1.1.1.512")==False



  if __name__ == "__main__":
      main()