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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_context(self):
 """ Reads throught the namespaces in the RML and generates a context for json+ld output when compared to the RdfNsManager namespaces """

        results = self.rml.query("""
                SELECT ?o {
                    {
                        ?s rr:class ?o
                    } UNION {
                        ?s rr:predicate ?o
                    }
                }""")
        namespaces = [Uri(row[0]).value[0]
                      for row in results
                      if isinstance(row[0], rdflib.URIRef)]
        self.context = {ns[0]: ns[1] for ns in namespaces if ns[0]}