rm valid filename

from datetime import datetime

import re

def is_valid_filename(file_name: str) -> bool:

    pattern = r'^.*\..*$'

    if re.match(pattern, file_name):

        return True

    else:

        raise False

def is_valid_datetime_format(date_str: str, format='%Y-%m-%d %H:%M:%S') -> bool:

    try: