[Python-Dev] Dict access with double-dot (syntactic sugar)

Thu Mar 24 23:14:09 CET 2011

>>> You're correct, this is trivial with object_hook.
>> >>> class AttrDict(dict):
> ... def __getattr__(self, attr):
> ... try:
> ... return self[attr]
> ... except KeyError:
> ... raise AttributeError(attr)
> ...
> >>> import json
> >>> obj = json.loads('{"foo": {"bar": "baz"}}', object_hook=AttrDict)
> {u'foo': {u'bar': u'baz'}}
> >>> obj.foo.bar
> u'baz'
>> -bob
>
That's pretty good, but it does clone the dict unnecessarily. I prefer:
class AttrDict(object):
 def __init__(self, adict):
 self.__dict__ = adict #a reference, not a copy
 def __getattr__(self, attr):
 if hasattr(dict, attr): #built-in methods of dict...
 return getattr(self.__dict__, attr) #...are bound directly to the dict
 else:
 try:
 return self.__dict__[attr]
 except KeyError:
 raise AttributeError(attr)
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