10000年的datetime.strptime()转换失败

def parse_date(date_str):
    if len(date_str) == 10:
        year = int(date_str[:4])
        month = int(date_str[5:7])
        day = int(date_str[8:10])
        if year >= 10000:
            return datetime.datetime(year=9999, month=12, day=31)
        else:
            try:
                return datetime.datetime(year=year, month=month, day=day)
            except ValueError:
                return None
    else:
        return None

date_str = "10000-01-01"
parsed_date = parse_date(date_str)
if parsed_date is not None:
    print("Parsed date:", parsed_date)
else:
    print("Failed to parse date:", date_str)