How do I make a command line program using click in python that takes separates command parameters that run different scripts?

Question

I have the following code:

import click

@click.group()
def cli():
    pass

@click.command()
def initdb():
    click.echo('Initialized the database')

@click.command()
def dropdb():
    click.echo('Dropped the database')

cli.add_command(initdb)
cli.add_command(dropdb)

At the command line I want to be able to do something like the following:

python clicktest.py cli initdb

and have the following happen echo at the terminal:

Initialized the database

Or to enter into the terminal:

python clicktest.py cli dropdb

and have the following happen on the terminal:

Dropped the database

My problem is currently when I do this at the terminal:

 python clicktest.py cli initdb

Nothing happens at the terminal, nothing prints when I think something should, namely the 'Initialized Database' echo. What am i doing wrong??

hallazzang · Accepted Answer · 2017-04-03 07:48:39Z

First, you should use it in command line like:

python clicktest.py initdb
python clicktest.py dropdb

And in your clicktest.py file, place these lines at the bottom of your code:

if __name__ == '__main__':
    cli()

Unless, your code won't get work.

EDIT:

If you really want to use it in a way python clicktest.py cli initdb, then you have another choice:

@click.group()
def main():
    pass

@click.group()
def cli():
    pass

@click.command()
def initdb():
    click.echo('Initialized the database')

@click.command()
def dropdb():
    click.echo('Dropped the database')

cli.add_command(initdb)
cli.add_command(dropdb)
main.add_command(cli)

if __name__ == '__main__':
    main()

Or even better (Using decorators instead):

@click.group()
def main():
    pass

@main.group()
def cli():
    pass

@cli.command()
def initdb():
    click.echo('Initialized the database')

@cli.command()
def dropdb():
    click.echo('Dropped the database')

if __name__ == '__main__':
    main()

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