remove_last12.py

import os

def change_dir(dir):

    for root, dirs, files in os.walk(dir):

        for f in files:
            file_path = os.path.join(root, f)
            change_file(file_path)

    return

def change_file(filename):
    target_suffix = ['mkv', 'mp4', 'webm']
    
    name, suffix = filename.split('.')    

    if suffix in target_suffix:

        new_filename = name[:-12] + '.' + suffix

        print('-----begin-----')
        print('old: \n', filename)
        print('new: \n', new_filename)
        print('-----end-------')
        print()

        os.rename(filename, new_filename)

    return


cur_dir = os.getcwd()
change_dir(cur_dir)