Main entry point allowing external calls

    Args:
      args ([str]): command line parameter list

def main(args):
    """Main entry point allowing external calls

    Args:
      args ([str]): command line parameter list
    """
    args = parse_args(args)
    setup_logging(args.loglevel)
    _logger.debug("Starting crazy calculations...")
    print("The {}-th Fibonacci number is {}".format(args.n, fib(args.n)))
    _logger.info("Script ends here")