python - Classes are scenes. Trying to repeat the scene if the answer is not consider -

i think titled question bad, can't think better. sorry (also, english not first language, sorry grammatical crimes).

in ex45 of 'learn python hard way', have make text game conditions, use 1 class per room. use code in ex44 (almost identical code below) prototype, cause can't undestand how 3 final lines works , interact everything. think novice in programming me, try write down, line line, following every step.

plus that, try make variable current_scene if introduce answer not contemplate in if variable, repeat scene.

from sys import exit random import randint   class engine(object):      def __init__(self, map_scenes):         self.map_scenes = map_scenes      def play(self):         current_scene = self.map_scenes.open_scene()          while true:             print "\n---------"             next_scene_name = current_scene.text()             current_scene = self.map_scenes.next_scene(next_scene_name)   class scene(object):      def texto(self):         print "parent class scenes"          exit(1)   class death(scene):      types = [         "you're death.",         "you pass away."     ]      def text(self):         print death.types[randint(0, len(self.types)-1)]          exit(1)    class again(scene):      repeat = [          "can repeat?",         "try again.",         "one more time."     ]      def text(self):         print again.repeat[randint(0, len(self.repeat)-1)]         print current_scene     # =/   class intro(scene):      def text(self):          print "the intro scene"          return 'start'   class start(scene):      def text(self):          print "the first scene"         print "where want go?"         next = raw_input("> ")          if next == "bear":              return 'bear'          elif next == "valley":              return 'valley'          elif next == "death":              return 'death'          else:              return 'again'   class bear(scene):      def text(self):          print "the second scene."         print "and on..."         exit(1)   class valley(scene):      def text(self):          print "alternative second scene."         print "and on..."         exit(1)   class map(object):      scenes = {         'intro': intro(),         'start': start(),         'bear': bear(),         'valley': valley(),          'again': again(),         'death': death()     }      def __init__(self, start_scene):         self.start_scene = start_scene      def next_scene(self, scene_name):         return map.scenes.get(scene_name)      def open_scene(self):         return self.next_scene(self.start_scene)   a_map = map('intro') a_game = engine(a_map) a_game.play() 

i hope i've explained myself well, stuck in exercise days , seems i'm not doing no progress @ all.

you have modify engine.play handle that:

next_scene_name = current_scene.text()  if next_scene_name in self.map_scenes.scenes:     current_scene = self.map_scenes.next_scene(next_scene_name)