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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 get_event(self, event_name, event_history=None):
 """Get an event from the database. Gets an event from the named event list removing the event and adding it to the event history. Args: event_name (str):
 Event list key. event_history (str, optional):
 Event history list. Returns: str: string representation of the event object """

        if event_history is None:
            event_history = event_name + '_history'
        return self._db.rpoplpush(event_name, event_history)