Introduction: $ pip install cliff python from cliff.app import App from cliff.command import Command class MyCommand(Command): def take_action(self, parsed_args): print("Hello, Cliff!") class MyCLI(App): def __init__(self): super(MyCLI, self).__init__( description='My awesome CLI app', version='1.0', command_manager='cliff.demo', ) def initialize_app(self, argv): self.LOG.debug('Initializing CLI application') def prepare_to_run_command(self, cmd): self.LOG.debug('Preparing to run CLI command') def clean_up(self, cmd, result, err): self.LOG.debug('Cleaning up after CLI command') def build_option_parser(self, description, version, argparse_kwargs=None): parser = super(MyCLI, self).build_option_parser( description, version, argparse_kwargs ) return parser def configure_logging(self): self.LOG.debug('Configuring logging') def run(self, argv): return super(MyCLI, self).run(argv) def main(argv=sys.argv[1:]): mycli_app = MyCLI() return mycli_app.run(argv) if __name__ == '__main__': sys.exit(main(sys.argv[1:])) python class Greet(Command): "Greet the user" def get_parser(self, prog_name): parser = super(Greet, self).get_parser(prog_name) parser.add_argument('--name', default='World', help='name to greet') return parser def take_action(self, parsed_args): print('Hello, {}!'.format(parsed_args.name)) $ python myapp.py greet --name Alice