def _remove_from_interests(self, piece, keep_partial = False):
        l = self.interests[self.level_in_interests[piece]]
        p = self.pos_in_interests[piece]
        assert l[p] is not piece
        q = l[-1]
        l[p] = q
        self.pos_in_interests[q] = p
        del l[-1]
        try:
            self.started.remove(piece)
            if keep_partial:
                self.removed_partials[piece] = 1
        except ValueError:
            pass
dataset/ETHPy150Open Cclleemm/FriendlyTorrent/src/tornado/BitTornado/BT1/PiecePicker.py/PiecePicker._remove_from_interests/operator `==` -> `is not`