code: def query_security_namespaces(self, security_namespace_id=None, local_only=None):
          
          route_values = {}
          if security_namespace_id is not None:
              route_values['securityNamespaceId'] = self._serialize.url('security_namespace_id', security_namespace_id, 'str')
          query_parameters = {}
          if local_only is not None:
              query_parameters['localOnly'] = self._serialize.query('local_only', local_only, 'bool')
          response = self._send(http_method='GET',
                                location_id='ce7b9f95-fde9-4be8-a86d-83b366f0b87a',
                                version='5.0',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('[SecurityNamespaceDescription]', self._unwrap_collection(response))
docs: QuerySecurityNamespaces.
          List all security namespaces or just the specified namespace.
          :param str security_namespace_id: Security namespace identifier.
          :param bool local_only: If true, retrieve only local security namespaces.
          :rtype: [SecurityNamespaceDescription]