code: def prepend(self, frame_p):
          
          return lib.zmsg_prepend(self._as_parameter_, byref(zframe_p.from_param(frame_p)))
docs: Push frame to the front of the message, i.e. before all other frames.
  Message takes ownership of frame, will destroy it when message is sent.
  Returns 0 on success, -1 on error. Deprecates zmsg_push, which did not
  nullify the caller's frame reference.