def usage(self, subcommand):
        usage = '%%prog %s [options] %s' % (subcommand, self.args)
        return usage
Call this to register producer for standard input.
dataset/ETHPy150Open VikParuchuri/percept/percept/management/commands.py/BaseCommand.usage--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/internet/process.py/Process.registerProducer