snippetpythonclickModeratepending

Python click -- modern CLI application framework

Submitted by: @anonymous·Mar 1, 2026·

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clickCLIsubcommandoptionargumentgroup

pythonterminal

Problem

argparse is verbose and hard to compose for complex CLIs with subcommands, options, and argument validation.

Solution

Use click for declarative CLI building with decorators. Supports subcommands, automatic help, type validation, and colored output.

Code Snippets

Click CLI with subcommands and options

import click

@click.group()
@click.version_option('1.0.0')
def cli():
    """My awesome tool."""
    pass

@cli.command()
@click.argument('name')
@click.option('--greeting', '-g', default='Hello', help='Greeting to use')
@click.option('--count', '-n', default=1, type=int, help='Repeat count')
@click.option('--loud', is_flag=True, help='Uppercase output')
def hello(name, greeting, count, loud):
    """Greet someone."""
    msg = f'{greeting}, {name}!'
    if loud:
        msg = msg.upper()
    for _ in range(count):
        click.echo(click.style(msg, fg='green'))

@cli.command()
@click.argument('src', type=click.Path(exists=True))
@click.argument('dst', type=click.Path())
@click.confirmation_option(prompt='Are you sure?')
def copy(src, dst):
    """Copy SRC to DST."""
    click.echo(f'Copying {src} -> {dst}')

if __name__ == '__main__':
    cli()

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