import functools
import time


def slow_down(_func=None, *, rate=1):
    """Sleep given amount of seconds before calling the function"""

    def decorator_slow_down(func):
        @functools.wraps(func)
        def wrapper_slow_down(*args, **kwargs):
            time.sleep(rate)
            return func(*args, **kwargs)

        return wrapper_slow_down

    if _func is None:
        return decorator_slow_down
    else:
        return decorator_slow_down(_func)


@slow_down(rate=2)
def countdown(from_number):
    if from_number < 1:
        print("Liftoff!")
    else:
        print(from_number)
        countdown(from_number - 1)


countdown(3)