CLI Tools

The unwritten contract every Python CLI framework is implementing under the hood - streams, exit codes, argument grammar, TTY detection, and config precedence - and why breaking it makes a tool hostile to scripting.

Anatomy of a good command-line tool.

Standard-library argument parsing and subcommands.

Decorated commands, options, and composition.

Type-hint-driven CLIs on top of Click.

Tables, progress bars, syntax highlighting, and logging.

Layering flags, env vars, and config files.

`questionary`/`prompt_toolkit` for wizards.

Discoverable, scriptable, well-behaved tools.