python-cli-patterns
CLI application patterns for Python. Triggers on: cli, command line, typer, click, argparse, terminal, rich, console, terminal ui.
What this skill does
# Python CLI Patterns
Modern CLI development with Typer and Rich.
## Basic Typer App
```python
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
```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" "[email protected]"
# myapp version
```
## Rich Output
```python
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]")
```
## Error Handling
```python
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
---
## See Also
**Related Skills:**
- `python-typing-patterns` - Type hints for CLI arguments
- `python-observability-patterns` - Logging for CLI applications
**Complementary Skills:**
- `python-env` - Package CLI for distribution
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