def _penalize_client(self, client):
if client in self.active_clients:  <EOL><INDENT>log.warning("<STR_LIT>", client)<EOL>self.active_clients.remove(client)<EOL>self.penalty_box.add(client)<EOL><DEDENT>else:<EOL><INDENT>log.info("<STR_LIT>")<EOL><DEDENT>
Place client in the penalty box.

        :param client: Client object