def comment(self, subject, default=''):
        """Query for the RDFS.comment of the subject

        Return default if no comment exists
        """
        if subject is None:
            return default
        return self.value(subject, RDFS.comment, default=default, any=True)
dataset/ETHPy150Open RDFLib/rdflib/rdflib/graph.py/Graph.comment/original