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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 start(self):
 """ Starts the partition service. """

        self.logger.debug("Starting partition service", extra=self._logger_extras)

        def partition_updater():
            self._do_refresh()
            self.timer = self._client.reactor.add_timer(PARTITION_UPDATE_INTERVAL, partition_updater)

        self.timer = self._client.reactor.add_timer(PARTITION_UPDATE_INTERVAL, partition_updater)