[Python-ideas] dictionary unpacking

[Georg Brandl]

Facundo Batista schrieb:
> 2008/3/31, Mathias Panzenböck <grosser.meister.morti-hi6Y0CQ0nG0 at public.gmane.org>:
> 
>> Maybe dictionary unpacking would be a nice thing?
>>
>>   >>> d = {'foo': 42, 'egg': 23}
>>   >>> {'foo': bar, 'egg': spam} = d
>>   >>> print bar, spam
>>  42 23
> 
> Bad idea.
> 
> It uncovers a lot of details for your brain to take care  when doing
> that, for example:
> 
>>>> d = {'foo': 42, 'egg': 23}
>>>> {'not': bar, 'egg': spam} = d
>>>> print bar
> ???
>>>> {'egg': bar, 'egg': spam} = d
>>>> print bar
> ???
> 
> I would consider something like the following:
> 
>   bar, spam = d.multiple("foo", "egg")
> 
> with the semantics of:
> 
>   bar, spam = [d[k] for k in ("foo", "egg")]

We also have

bar, spam = itemgetter("foo", "egg")(d)

if some functional form is preferred.

Georg

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