Correctly rename youtube downloaded official songs with Artist and Title.

renameYTsongs.py

import stagger
from stagger.id3 import *
import os

dir_name = "/path/to/dir/with/songs"
file_list = os.listdir(dir_name)
# Filename in format = "Ariana Grande - No Tears Left To Cry.mp3"
for filename in file_list:
    full_filename = dir_name + "/" + filename
    print(full_filename)
    tag = stagger.read_tag(full_filename)
    splited_name = tag.title.split(" - ")
    if len(splited_name) < 2: splited_name.append(splited_name[0])
    artist = splited_name[0].strip()
    title = splited_name[1].replace("[", "").replace("]", "").replace("(", "").replace(")", "").replace("|", "").replace("'", "").replace('"', "").replace("video", "").replace("Video", "").replace("Offical", "").replace("Music", "").strip()
    tag.title = title           # Alternative, friendlier API
    tag.album_artist = artist
    tag.artist = artist
    tag.write()
    os.rename(full_filename, dir_name + "/" + title + ".mp3")