Python script to find filenames and directories including non-standard characters

This script prints file- and directorynames recursively which have characters in their name not belonging to either the Unicode basic latin or Latin-1 supplement blocks.

#!/usr/bin/env python3
import os
import argparse

def is_valid_char(c):
    """Check if a character is within Basic Latin or Latin-1 Supplement Unicode blocks."""
    return '0000' <= f"{ord(c):04x}" <= '00ff'

def contains_invalid_chars(name):
    """Check if a string contains characters outside Basic Latin or Latin-1 Supplement."""
    return any(not is_valid_char(c) for c in name)

def check_directory(path):
    """Recursively check directories and files for invalid characters in their names."""
    for root, dirs, files in os.walk(path):
        for name in dirs + files:
            if contains_invalid_chars(name):
                print(os.path.join(root, name))

def main():
    parser = argparse.ArgumentParser(description="Check for files and directories with invalid characters in their names.")
    parser.add_argument('path', type=str, help="The path to the directory to check.")
    args = parser.parse_args()
    if not os.path.isdir(args.path):
        print(f"The path {args.path} is not a valid directory.")


if __name__ == "__main__":