change_names.py

# pip install pytube

from pytube import Playlist
import os

dir = 'DIR_PATH'

current_names = os.listdir(dir)

for i, name in enumerate(current_names):
    current_names[i] = dir + current_names[i]

playlist_url = 'PLAYLIST_URL'

playlist = Playlist(playlist_url)

youtube_names = []

for video in playlist.videos:
    youtube_names.append(os.path.splitext(video.title)[0])

for i, (youtube_name, current_name) in enumerate(zip(youtube_names, current_names)):
    try:
        os.rename(current_name, f'{dir}{i + 1}.{youtube_name}.mp4')
    except Exception as e:
        print(f'Error renaming {current_name}: {str(e)}')