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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def exit_on_signal():
 """ Install a signal handler for HUP, INT, and TERM to call exit, allowing clean shutdown. When running a universe environment, it's important to shut down the container when the agent dies so you should either call this or otherwise arrange to exit on signals. """

    def shutdown(signal, frame):
        logger.warn('Received signal %s: exiting', signal)
        sys.exit(128+signal)
    signal.signal(signal.SIGHUP, shutdown)
    signal.signal(signal.SIGINT, shutdown)
    signal.signal(signal.SIGTERM, shutdown)