Auto-Register Commands

Hard ⏱ 18 min 28% acceptance ★★★★★ 4.6

CLI frameworks auto-discover commands via decorators. Build a module-level dict COMMANDS and the decorator command(name) that registers the function under name and returns it unmodified (registration decorators don't wrap). Then dispatch(name, *args) looks up and calls the command, raising KeyError naturally for unknown names.

Examples

Example 1

Input

@command('greet') on hello; dispatch('greet', 'Ana')

Output

hello('Ana')'s result

Explanation

The decorator filed the function; dispatch found it.

Constraints

The decorator returns func itself.
COMMANDS maps name → function.

Topics

Decoratorsregistry pattern

Companies

HashiCorpDockerRed Hat

Hints

Hint 1

Registration happens at import time.

Hint 2

return func — no wrapper layer.

← A Wrapper That Counts Itself GST Invoice Calculator →

Loading the Python runtime… Run executes your code and shows printed output; Submit checks your function against this problem's examples.