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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:
 async def xrange(self, name: str, start='-', end='+', count=None) -> list: """ Read stream values within an interval. Available since 5.0.0. Time complexity: O(log(N)+M) with N being the number of elements in the stream and M the number of elements being returned. If M is constant (e.g. always asking for the first 10 elements with COUNT), you can consider it O(log(N)). :param name: name of the stream. :param start: first stream ID. defaults to '-', meaning the earliest available. :param end: last stream ID. defaults to '+', meaning the latest available. :param count: if set, only return this many items, beginning with the earliest available. :return list of (stream_id, entry(k-v pair)) """


        pieces = [start, end]
        if count is not None:
            if not isinstance(count, int) or count < 1:
                raise RedisError("XRANGE count must be a positive integer")
            pieces.append("COUNT")
            pieces.append(str(count))
        return await self.execute_command('XRANGE', name, *pieces)