code: def add_song(self, new_song, verbose=True):
          
  
          if any([song.title == new_song.title for song in self._songs]):
              if verbose:
                  print('{s} already in {a}, not adding song.'.format(s=new_song.title,
                                                                      a=self.name))
              return 1  # Failure
          if new_song.artist == self.name:
              self._songs.append(new_song)
              self._num_songs += 1
              return 0  # Success
          if verbose:
              print("Can't add song by {b}, artist must be {a}.".format(b=new_song.artist,
                                                                        a=self.name))
          return 1
docs: Add a Song object to the Artist object