Thanos Tsouanas a écrit :
> On Sun, Jul 24, 2005 at 01:43:43PM +1000, Steven D'Aprano wrote:
(snip)
>
>>Why jump through all those hoops to get attributes when Python already
>>provides indexing and attribute grabbing machinery that work well? Why do
>>you bother to subclass dict, only to mangle the dict __getitem__ method so
>>that you can no longer retrieve items from the dict?
>
> Because *obviously* I don't know of these indexing and attribute
> grabbing machineries you are talking about in my case. If you cared to
> read my first post, all I asked was for the "normal", "built-in" way to
> do it. Now, is there one, or not?
If you re-read your first post, you'll notice that you didn't say
anything about the intention, only about implementation !-)
Now if your *only* need is to access object as a dict for formated
output, you don't need to subclass dict. This is (well, should be) enough:
class Wrapper(object):
def __init__(self, obj):
self._obj = obj
def __getitem__(self, name):
return getattr(self._obj, name)
This works with 'normal' attributes as well as with properties. Notice
that this wrapper is read-only, and don't pretend to be a real
dictionnary - but still it implements the minimum required interface for
"%(attname)s" like formatting.
HTH
Bruno
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