Asynchronously execute the specified CQL query.

        The execute command also takes optional parameters and trace
        keyword arguments. See cassandra-python documentation for
        definition of those parameters.

def execute(self, query, *args, **kwargs):
        """Asynchronously execute the specified CQL query.

        The execute command also takes optional parameters and trace
        keyword arguments. See cassandra-python documentation for
        definition of those parameters.
        """
        tornado_future = Future()
        cassandra_future = self._session.execute_async(query, *args, **kwargs)
        self._ioloop.add_callback(
            self._callback, cassandra_future, tornado_future)
        return tornado_future