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pschanely/main.py

Created November 13, 2025 13:07
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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.match('[1-9][0-9][0-9][0-9]', yearstring) else None
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