def METHOD_NAME(self):
    for (account, (process, log_file)) in self._nodes.items():
        logging.info("Terminating node %s", account)
        process.terminate()
        process.wait(timeout=TIMEOUT_TERMINATE_IN_SECONDS)
        process.kill()
        logging.info("Node for %s has terminated.", account)
        if log_file is not None:
            log_file.close()
    self._nodes = {}
    logging.info("Teardown network completed!")