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Thu Mar 24 19:46:33 CET 2011 · https://mail.python.org/pipermail/python-dev/2011-March/110032.html

>
>
> If you need this for **kw arguments maybe you're not using them right;
> why not name your arguments if you're going to reference them by name?
>

Good point.

>
> The JSON use case seems to be driven because this is the way
> JavaScript does things -- they don't distinguish between dicts and
> objects. I personally think that's a poor language feature: it blurs a
> line that should be clear, between data (dict keys) and program
> variables (attributes).
>
> OK. So if this is a json-only issue, it can be done using a wrapper and
object_hook in the json library. I believe that, since all the magic
functions are pulled from the class, not the instance, you should even be
able to use  "if 'a' in wrapped_dict:" and "for a in wrapped_dict:" if your
wrapper class delegates __contains__ and __iter__ to the underlying dict.
Anyway, you can use hasattr for the former.

So my overarching proposal has shrunk to a suggestion that I should go and
make a attrlyjson module which does this by default. I certainly think that
I can get it right, and I know that there are several easy ways to get it
wrong, so it's worth saving people the headache.

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