Click example

cli.py

#!/usr/bin/env python

import click


@click.group()
@click.option('--foo', help='This is great.')
def cli(foo):
    pass


@cli.add_command
@click.command()
@click.option('--name', prompt='Your name', help='The person to greet.')
def hello(name):
    """Simple program that greets NAME."""
    click.echo('Hello %s!' % name)


@cli.add_command
@click.command()
@click.option('--param', default='', help='Asdf.')
def world(param):
    '''World domination'''
    pass


if __name__ == '__main__':
    cli()

gistfile1.txt

(ve)grant:clitest joneskoo $ python cli.py 
Usage: cli.py [OPTIONS] COMMAND [ARGS]...

Options:
  --foo TEXT  This is great.
  --help      Show this message and exit.

Commands:
  hello  Simple program that greets NAME.
  world  World domination
----------------------------------------------------------------------------------
(ve)grant:clitest joneskoo $ python cli.py hello --help
Usage: cli.py hello [OPTIONS]

  Simple program that greets NAME.

Options:
  --name TEXT  The person to greet.
  --help       Show this message and exit.
----------------------------------------------------------------------------------
(ve)grant:clitest joneskoo $ python cli.py hello --name foo
Hello foo!
----------------------------------------------------------------------------------
(ve)grant:clitest joneskoo $ python cli.py hello 
Your name: bar
Hello bar!