Shared via CrossHair Playground

main.py

import re
from typing import Optional

def parse_year(yearstring: str) -> Optional[int]:
    '''
    Something is wrong with this year parser! Can you guess what it is?
    
    post: __return__ is None or 1000 <= __return__ <= 9999
    '''
    return int(yearstring) if re.fullmatch('[1-9][0-9][0-9][0-9]', yearstring) else None