python clickでサブコマンドを簡単に実装する ref: http://qiita.com/mountcedar/items/45b06ce58b1d2ae001f3

file0.txt

$ pip install click

file1.txt

import click

@click.group(invoke_without_command=True)
@click.pass_context
def cli(ctx):
    if ctx.invoked_subcommand is None:
        print ctx.get_help()
    else:
        print('gonna invoke %s' % ctx.invoked_subcommand)


@cli.command(help='description 1')
@click.argument('target', required=False)
def subcommand1(target):
    print "sub command 1"

@cli.command(help='description 2')
@click.argument('target', required=False)
def subcommand2(target):
    print "sub command 2"

if __name__ == '__main__': cli()

file2.txt

Usage: sample.py [OPTIONS] COMMAND [ARGS]...

Options:
  --help  Show this message and exit.

Commands:
  subcommand1  description 1
  subcommand2  description 2

file3.txt

...

class AliasedGroup(click.Group):
    def get_command(self, ctx, cmd_name):
        rv = click.Group.get_command(self, ctx, cmd_name)
        if rv is not None:
            return rv

        if cmd_name == 'shortcut':
            return click.Group.get_command(self, ctx, 'subcommand1')

        return None

@click.group(cls=AliasedGroup, invoke_without_command=True)
@click.pass_context
def cli(ctx):
...

file4.txt

$ python ./sample.py shortcut
gonna invoke shortcut
sub command 1

file5.txt

@click.group(invoke_without_command=True)
@click.pass_context
def handle(ctx):
    if ctx.invoked_subcommand is None:
        print ctx.get_help()
    else:
        print('gonna invoke %s' % ctx.invoked_subcommand)

@click.command()
def hoge():
    pass

handle.add_command(hoge)