def remember(self, these):
        """
        return a frozen dict only of bindings in these
        """
        return FrozenBindings(self.ctx, (x for x in self.iteritems() if these in x[0]))
dataset/ETHPy150Open RDFLib/rdflib/rdflib/plugins/sparql/sparql.py/FrozenBindings.remember/swapped operands of `in`