Extensionchecker

Updated: 21 dec 2025

This code walks through a specified folder and all subfolders to identify the kind of files that are present. It returns the extensions.

import os

directory = '..'

def find_file_extensions(directory):
    extensions = set()  # Used to exclude duplicates
    # Iterate over all files in the specified folder
    for root, dirs, files in os.walk(directory):
        for file in files:
            _, ext = os.path.splitext(file)  # Splits the filename to extract the extension
            if ext:  # Check whether the extension already exists
                extensions.add(ext.lower())  # Adds the extension and uses lowercase
    return print(extensions)

find_file_extensions(directory)