@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

```python
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" "john@example.com"
#        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", "alice@example.com"),
        (2, "Bob", "bob@example.com"),
    ]
    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]")

Error Handling

import typer
from rich.console import Console

console = Console()

def error(message: str, code: int = 1):
    """Print error and exit."""
    console.print(f"[red]Error:[/red] {message}")
    raise typer.Exit(code)

@app.command()
def process(file: str):
    """Process a file."""
    if not os.path.exists(file):
        error(f"File not found: {file}")

    try:
        result = process_file(file)
        console.print(f"[green]Success:[/green] {result}")
    except ValueError as e:
        error(str(e))

Quick Reference

Feature	Typer Syntax
Required arg	`name: str`
Optional arg	`name: str = "default"`
Option	`typer.Option(default, "--flag", "-f")`
Argument	`typer.Argument(..., help="...")`
Boolean flag	`verbose: bool = False`
Enum choice	`color: Color = Color.red`

Rich Feature	Usage
Table	`Table()` + `add_column/row`
Progress	`track(items)`
Colors	`[red]text[/red]`
Panel	`Panel("content", title="Title")`

Additional Resources

./references/typer-patterns.md - Advanced Typer patterns
./references/rich-output.md - Rich tables, progress, formatting
./references/configuration.md - Config files, environment variables

Assets

./assets/cli-template.py - Full CLI application template

Rich Output

Error Handling

Quick Reference

Additional Resources

Assets

See Also

python-cli-patterns

Python CLI Patterns

Basic Typer App