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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 create_stream(self, unique_id=0, listener=None, timeout=11, buffer_size=1024, description='BetfairSocket', host=None):
 """ Creates BetfairStream. :param dict unique_id: Id used to start unique id's of the stream (+1 before every request) :param resources.Listener listener: Listener class to use :param float timeout: Socket timeout :param int buffer_size: Socket buffer size :param str description: Betfair stream description :param str host: Host endpoint (prod (default) or integration) :rtype: BetfairStream """

        listener = listener if listener else BaseListener()
        return BetfairStream(
            unique_id,
            listener,
            app_key=self.client.app_key,
            session_token=self.client.session_token,
            timeout=timeout,
            buffer_size=buffer_size,
            description=description,
            host=host,
        )