Method _validate_callable_param_count

cmd2/cmd2.py:5813–5820

Ensure a function has the given number of parameters.

(cls, func: Callable[..., Any], count: int)

    @classmethod
    def _validate_callable_param_count(cls, func: Callable[..., Any], count: int) -> None:
        """Ensure a function has the given number of parameters."""
        signature = inspect.signature(func)
        # validate that the callable has the right number of parameters
        nparam = len(signature.parameters)
        if nparam != count:
            plural = "" if nparam == 1 else "s"
            raise TypeError(f"{func.__name__} has {nparam} positional argument{plural}, expected {count}")

    @classmethod
    def _validate_prepostloop_callable(cls, func: Callable[[], None]) -> None: