[Python] CS50P-problem set 7-working 9 to 5-pytest exit code

I don't know why it's showing the exit code for test_working.py is 2. Please see the screenshot for the error message I got from check50:

Both file works well on my end...

I ran "pytest test_working.py" on my end and all tests passed

Can somebody please help me? Thanks!

Here is the "working.py":

import re
import sys


def main():
try:
print(convert(input("Hours: ").strip()))
sys.exit(0)
except ValueError as e:
print(e)
sys.exit(1)



def convert(s):
matches = re.search(r"^(1?[0-9]):?([0-6][0-9])? (AM|PM) to " \
r"(1?[0-9]):?([0-6][0-9])? (AM|PM)$", s)
if not matches:
raise ValueError("ValueError")
else:
from_hour, from_min = matches.group(1), matches.group(2)
from_meridiem = matches.group(3)
to_hour, to_min = matches.group(4), matches.group(5)
to_meridiem = matches.group(6)

from_hour = convert_hour(from_hour, from_meridiem)
to_hour = convert_hour(to_hour, to_meridiem)

from_min = convert_min(from_min)
to_min = convert_min(to_min)

if ((from_hour == None) or (from_min == None) or
(from_hour == None) or (from_min == None)):
raise ValueError("ValueError")

return f"{from_hour}:{from_min} to {to_hour}:{to_min}"



def convert_hour(h, meridiem):
if 1 <= int(h) <= 12:
if meridiem == "AM":
if len(h) == 1:
return ("0"+ h)
elif h == "12":
return "00"
else:
return h
else:
if h == "12":
return h
else:
return f"{int(h) + 12}"
else:
return None



def convert_min(min):
if min == None:
return "00"
elif 0 <= int(min) <= 59:
return min
else:
return None



if __name__ == "__main__":
main()



Here is the "test_working.py":

import pytest
from working import convert, convert_hour, convert_min


def test_convert():
assert convert("9 AM to 5 PM") == "09:00 to 17:00"
assert convert("9:00 AM to 5:00 PM") == "09:00 to 17:00"
assert convert("10 AM to 8:50 PM") == "10:00 to 20:50"
assert convert("10:30 PM to 8 AM") == "22:30 to 08:00"


def test_convert_hour():
assert convert_hour("9", "AM") == "09"
assert convert_hour("12", "AM") == "00"
assert convert_hour("12", "PM") == "12"
assert convert_hour("1", "PM") == "13"
assert convert_hour("13", "PM") == None
assert convert_hour("0", "PM") == None
assert convert_hour("0", "AM") == None
assert convert_hour("13", "AM") == None


def test_convert_min():
assert convert_min("60") == None
assert convert_min("30") == "30"


def test_value_error():
with pytest.raises(ValueError):
convert("14:50 AM to 13:30 PM")
with pytest.raises(ValueError):
convert("9:60 AM to 5:60 PM")
with pytest.raises(ValueError):
convert("9 AM - 5 PM")
with pytest.raises(ValueError):
convert("09:00 AM - 17:00 PM")

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