human
Complete this python program:
def main(args=None):
assistant
#Here is the Python program you requested.

    """Perform a single benchmark run, starting and stopping the reactor and
    logging system as necessary.
    """
    startLogging(stdout)
    options = BufferingBenchmark()
    options.parseOptions(args)
    d = benchmark(options['scale'])
    def cbBenchmark(result):
        pprint(result)
    def ebBenchmark(err):
        print(err.getTraceback())
    d.addCallbacks(cbBenchmark, ebBenchmark)
    def stopReactor(ign):
        reactor.stop()
    d.addBoth(stopReactor)
    reactor.run()