On Mon, Jun 7, 2010 at 2:17 PM, kkumer
<kku...@best-search-engines-mail.com> wrote:
>
> I have to merge two dictionaries into one, and in
> a "shallow" way: changing items should be possible
> by operating either on two parents or on a
> new dictionary. I am open to suggestions how
> to do this (values are always numbers, BTW), but
> I tried to do it by creating a dict-like class that just
> forwards all calls to the two parent dicts, see below.
>
> It works, but one important thing is missing. I
> am not able to expand new dictionary with
> double-star operator ** to use it as a
> set of keyword arguments of a function.
> I googled a bit, but was unable to find what
> property must an object have to be correctly
> treated by **.
I don't think that what you want to do here is possible. It appears
to be hard-coded and not affected by subclassing, as evidenced by the
following snippet:
class NonDict(dict):
for attr in dict.__dict__:
if attr not in ('__init__', '__new__',):
locals()[attr] = None
d = NonDict({'a': 1})
def kwa(**kw): print kw
kwa(**d)
Prints:
{'a': 1}
Cheers,
Ian
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