code: def on_parallel_port_change(self, parallel_port):
          
          if not isinstance(parallel_port, IParallelPort):
              raise TypeError("parallel_port can only be an instance of type IParallelPort")
          self._call("onParallelPortChange",
                       in_p=[parallel_port])
docs: Triggered when settings of a parallel port of the
          associated virtual machine have changed.
  
          in parallel_port of type :class:`IParallelPort`
  
          raises :class:`VBoxErrorInvalidVmState`
              Session state prevents operation.
          
          raises :class:`VBoxErrorInvalidObjectState`
              Session type prevents operation.