# Python Click Module

Click is a Python package for creating beautiful command line interfaces in a composable way with as little code as necessary. It's the "Command Line Interface Creation Kit".

## Installation

```bash
pip install click
```

## Basic Usage

Click uses decorators to bind functions to command line commands.

```python
import click

@click.command()
def hello():
    click.echo('Hello World!')

if __name__ == '__main__':
    hello()
```

## Adding Options

You can add options using `@click.option`.

```python
import click

@click.command()
@click.option('--count', default=1, help='Number of greetings.')
@click.option('--name', prompt='Your name', help='The person to greet.')
def hello(count, name):
    for _ in range(count):
        click.echo(f"Hello {name}!")

if __name__ == '__main__':
    hello()
```

Run: `python script.py --count=3` (it will prompt for name).

## Arguments

Arguments are positional parameters.

```python
@click.command()
@click.argument('filename')
def touch(filename):
    click.echo(f"Touching {filename}")
```

## Grouping Commands

You can group multiple commands under a single entry point.

```python
import click

@click.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__':
    cli()
```

Run: `python script.py initdb`

[[programming/python/python]]