Returns a dict of source name and sensors with their values

def get_summary(self):
        """ Returns a dict of source name and sensors with their values """
        graph_vector_summary = OrderedDict()
        graph_vector_summary[self.get_source_name()] = (
            '[' + self.measurement_unit + ']')
        graph_vector_summary.update(self.get_sensors_summary())
        return graph_vector_summary