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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 persist(self):
 """Trigger saving the current sensorgraph to persistent storage."""


        self.persisted_nodes = self.graph.dump_nodes()
        self.persisted_streamers = self.graph.dump_streamers()
        self.persisted_exists = True
        self.persisted_constants = self._sensor_log.dump_constants()