[Tutor] (no subject)

[Danny Yoo]

On Sun, 24 Feb 2002, Britt Green wrote:

> Can anyone tell me why I get this error on the following code, and what
> a good solution for it would be?
> 
> >>> 
> --> e
> You are in the foyer
> --> w
> Traceback (most recent call last):
>   File "C:/WINNT/Profiles/bgreen/Desktop/kode/fourth.py", line 37, in ?
>     if playerLoc.exits.has_key(command[0]):
> AttributeError: 'str' object has no attribute 'exits'
> 

I'm guessing that 'playerLoc' is a Room:


> class Room:
>     def __init__(self, name, exits):
>         self.name = name
>         self.exits = exits
>         self.items = []
> 
>     def __str__(self):
>         return self.name
> 
> porch = Room('porch', {'e':'foyer'})
> foyer = Room('foyer', {'w':'porch', 'e':'dining room'})
> dining = Room('dining room', {'w':'foyer'})


When we try to look at the exits of a romm, like the porch, we'll find
that we get:

###
>>> porch.exits
{'e': 'foyer'}
>>> foyer
<__main__.Room instance at 0x814d72c>
###

So there's a difference between 'foyer' and the foyer room --- we actually
need to the the room instance whose name is 'foyer', and we need to make
that distinction.


Here's one way to approach the problem: We can make a dictionary of all
the rooms, so that once we have the name of an exit, we can get that exit
room.

###
all_rooms = {}
for name, room in [('porch', porch),
                   ('foyer', foyer),
                   ('dining', dining)]:
    all_rooms[name] = room
###


Hope this helps!