Getting a dictionary from an object

[Steven D'Aprano]

On Sat, 23 Jul 2005 11:48:27 +0300, Thanos Tsouanas wrote:

> Hello.
> 
> I would like to have a quick way to create dicts from object, so that a
> call to foo['bar'] would return obj.bar.

That looks rather confusing to me. Why not just call obj.bar, since it
doesn't look like you are actually using the dictionary at all?

> The following works, but I would prefer to use a built-in way if one
> exists.  Is there one?
> 
> Thanks in advance.
> 
> class dictobj(dict):
>     """
>     class dictobj(dict):
>     A dictionary d with an object attached to it,
> 	which treats d['foo'] as d.obj.foo.
>     """
>     def __init__(self, obj):
>         self.obj = obj
>     def __getitem__(self, key):
>         return self.obj.__getattribute__(key)

I don't think this is particularly useful behaviour. How do you use it?

py> D = dictobj("hello world")
py> D
{}
py> D.obj
'hello world'
py> D["food"] = "spam"
py> D
{'food': 'spam'}
py> D["food"]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 5, in __getitem__
AttributeError: 'str' object has no attribute 'food'


-- 
Steven.