如何在Python中只运行一次ASCIImatics动画？

from asciimatics.screen import Screen
from asciimatics.scene import Scene
from asciimatics.effects import Print
from asciimatics.renderers import FigletText

def demo(screen):
    scenes = []
    effects = [
        Print(screen,
              FigletText("Hello, World!", font='big'),
              x=screen.width // 2 - 40,
              y=screen.height // 2 - 6,
              colour=Screen.COLOUR_GREEN,
              speed=1),
    ]
    scenes.append(Scene(effects, -1))
    screen.play(scenes)

Screen.wrapper(demo)