'Yields a list of synsets of which this synset is a member/part, for example:
synsets("tree")[0].holonyms() => Synset("forest").'

def holonyms(self):

    p = self._synset.getPointers(wn.MEMBER_MERONYM)
    p += self._synset.getPointers(wn.PART_MERONYM)
    return [Synset(p.getTarget()) for p in p]
