Method register_preloop_hook

cmd2/cmd2.py:5831–5834

Register a function to be called at the beginning of the command loop.

(self, func: Callable[[], None])

            raise TypeError(f"{func.__name__} must have a return type of 'None', got: {ret_ann}")

    def register_preloop_hook(self, func: Callable[[], None]) -> None:
        """Register a function to be called at the beginning of the command loop."""
        self._validate_prepostloop_callable(func)
        self._preloop_hooks.append(func)

    def register_postloop_hook(self, func: Callable[[], None]) -> None:
        """Register a function to be called at the end of the command loop."""