python-cli-ops

Python CLI Patterns

Modern CLI development with Typer and Rich.

Basic Typer App

import typer

app = typer.Typer(
    name="myapp",
    help="My awesome CLI application",
    add_completion=True,
)

@app.command()
def hello(
    name: str = typer.Argument(..., help="Name to greet"),
    count: int = typer.Option(1, "--count", "-c", help="Times to greet"),
    loud: bool = typer.Option(False, "--loud", "-l", help="Uppercase"),
):
    """Say hello to someone."""
    message = f"Hello, {name}!"
    if loud:
        message = message.upper()
    for _ in range(count):
        typer.echo(message)

if __name__ == "__main__":
    app()

Command Groups

import typer

app = typer.Typer()
users_app = typer.Typer(help="User management commands")
app.add_typer(users_app, name="users")

@users_app.command("list")
def list_users():
    """List all users."""
    typer.echo("Listing users...")

@users_app.command("create")
def create_user(name: str, email: str):
    """Create a new user."""
    typer.echo(f"Creating user: {name} <{email}>")

@app.command()
def version():
    """Show version."""
    typer.echo("1.0.0")

# Usage: myapp users list
#        myapp users create "John" "[email protected]"
#        myapp version

Rich Output

from rich.console import Console
from rich.table import Table
from rich.progress import track
from rich.panel import Panel
import typer

console = Console()

@app.command()
def show_users():
    """Display users in a table."""
    table = Table(title="Users")
    table.add_column("ID", style="cyan")
    table.add_column("Name", style="green")
    table.add_column("Email")

    users = [
        (1, "Alice", "[email protected]"),
        (2, "Bob", "[email protected]"),
    ]
    for id, name, email in users:
        table.add_row(str(id), name, email)

    console.print(table)

@app.command()
def process():
    """Process items with progress bar."""
    items = list(range(100))
    for item in track(items, description="Processing..."):
        do_something(item)
    console.print("[green]Done![/green]")