iterator over similar artists as :class:`Artist` objects

def similar(self):
        """
        iterator over similar artists as :class:`Artist` objects
        """
        if self._similar is None:
            self._similar = [
                Artist(artist['ArtistID'], artist['Name'], self._connection)
                for artist in self._connection.request(
                    'artistGetSimilarArtists',
                    {'artistID': self.id},
                    self._connection.header('artistGetSimilarArtists'))[1]['SimilarArtists']]
        return iter(self._similar)