[Tutor] exercise with classes 2nd attempt

[Tonu Mikk]

I am learning Python using the "Learn Python the Hard Way" book by Zed
Shaw<http://learnpythonthehardway.org/>.
 I reached exercise 42 where we learn about Python
classes<http://learnpythonthehardway.org/book/ex42.html>.
 The exercise shows a game with one class that includes all the definitions
for playing the game.  For extra credit we are asked to create another
version of this game where we use two classes - one for the room
definitions and the other for the playing the game.

May attempt at creating two classes is here http://codepad.org/963vUgSt .
 I get the following error which I have been un-able to resolve.  Any
suggestions are welcome.

Traceback (most recent call last):
  File "ex42_3.py", line 233, in <module>
    run()
  File "ex42_3.py", line 231, in run
    room1.doIt()          # plays the game
  File "ex42_3.py", line 32, in doIt
    self.obj.play() # use object
  File "ex42_3.py", line 20, in play
    room = getattr(self, next)
AttributeError: 'Engine' object has no attribute 'central_corridor'

Tonu
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