Practice of all

import os,shutil

audio_extensions =('.mp3','.m4a','.wav','.flac')
video_extensions =('.mp4','mkv','.flv','.mpeg','.csv')
documents_extensions =('.doc','.pdf','.txt')

folder_path = input('enter folder path :')


def file_finder(folder_path,file_extensions):
    files = []
    for file in os.listdir(folder_path):
        for extension in file_extensions:
            if file.endswith(extension):
                files.append(files)
    return files

print(file_finder(folder_path,documents_extensions))