def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def test_can_encode_relationship_with_alternative_names(self):
        a = Node("Person", nom=u"Aimée")
        b = Node("Person", nom=u"Baptiste")
        ab = KNOWS_FR(a, b)
        encoded = cypher_repr(ab, related_node_template=u"{property.nom}")
        self.assertEqual(u"(Aimée)-[:CONNAÎT {}]->(Baptiste)", encoded)