code: def delete(self):
          
          try:
              yield from wait_run_in_executor(shutil.rmtree, self._working_directory)
          except OSError as e:
              log.warn("Could not delete file {}".format(e))
  
          self.manager.release_dynamips_id(self._project.id, self._dynamips_id)
docs: Delete this VM (including all its files).