def add(self, (s, p, o)):
        """Add a triple with self as context"""
        assert isinstance(s, Node), \
            "Subject %s must be an rdflib term" + (s,)
        assert isinstance(p, Node), \
            "Predicate %s must be an rdflib term" % (p,)
        assert isinstance(o, Node), \
            "Object %s must be an rdflib term" % (o,)

        self.store.add((s, p, o), self, quoted=True)
dataset/ETHPy150Open RDFLib/rdflib/rdflib/graph.py/QuotedGraph.add/operator `%` -> `+`