class Scene(object): def enter(self): pass class Engine(object): def __init__(self, scene_map): pass def play(self): pass class Death(Scene): def enter(self): pass class CentralCorridor(Scene): def enter(self): pass class LaserWeaponArmory(Scene): def enter(self): pass class TheBridge(Scene): def enter(self): pass class EscapePod(Scene): def enter(self) pass class Map(object): def __init__(self, start_scene): pass def next_scene(self, scene_name): pass def opening_scene(self): pass a_map = Map('central_corridor') a_game = Engine(a_map) a_game.play()