import os

var = ''
longeur = 0
liste = os.listdir(os.getcwd())

for mot in liste:
  if '[Official Video]' in mot:
    longeur = len(mot) - 20
    var = mot[:longeur] + '.mp3'
    os.rename(mot, var)
  elif '(Official Video)' in mot:
    longeur = len(mot) - 20
    var = mot[:longeur] + '.mp3'
    os.rename(mot, var)
  elif 'Official Video' in mot:
    longeur = len(mot) - 18
    var = mot[:longeur] + '.mp3'
    os.rename(mot, var)