code: def shutdown(self):
  		
  		if not self.pyro_ns is None:
  			self.pyro_ns.shutdown()
  			self.pyro_ns = None
  		
  		if not self.conf_fn is None:
  			os.remove(self.conf_fn)
  			self.conf_fn = None
docs: clean shutdown of the nameserver and the config file (if written)