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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 revrange(self, start='+', stop='-', count=None):
 """ Read a range of values from a stream in reverse. :param start: start key of range (inclusive) or '+' for newest message :param stop: stop key of range (inclusive) or '-' for oldest message :param count: limit number of messages returned """

        return self.database.xrevrange(self.key, start, stop, count)