code: def result(self):
          
          self._event.wait()
          if self._final_result is not _NOT_SET:
              return ResultSet(self, self._final_result)
          else:
              raise self._final_exception
docs: Return the final result or raise an Exception if errors were
          encountered.  If the final result or error has not been set
          yet, this method will block until it is set, or the timeout
          set for the request expires.
  
          Timeout is specified in the Session request execution functions.
          If the timeout is exceeded, an :exc:`cassandra.OperationTimedOut` will be raised.
          This is a client-side timeout. For more information
          about server-side coordinator timeouts, see :class:`.policies.RetryPolicy`.
  
          Example usage::
  
              >>> future = session.execute_async("SELECT * FROM mycf")
              >>> # do other stuff...
  
              >>> try:
              ...     rows = future.result()
              ...     for row in rows:
              ...         ... # process results
              ... except Exception:
              ...     log.exception("Operation failed:")