[Python-ideas] Unpacking a dict
Eric V. Smith
eric at trueblade.com
Sun May 29 08:35:46 EDT 2016
On 5/28/2016 1:34 PM, Joao S. O. Bueno wrote:
> On 27 May 2016 at 12:37, Zachary Ware <zachary.ware+pyideas at gmail.com> wrote:
>> On Fri, May 27, 2016 at 10:32 AM, Michael Selik <michael.selik at gmail.com> wrote:
>>> On Fri, May 27, 2016 at 11:28 AM Zachary Ware
>>> <zachary.ware+pyideas at gmail.com> wrote:
>>>> Here's a crazy thought that might be best dismissed out of hand: what
>>>> about extending 'from name import other_names' to accept any object
>>>> for <name>? First try to get values via __getitem__() (possibly only
>>>> for dict/dict subclasses?), next try getattr(), finally try to import
>>>> the module and pull values from it as per usual.
>>>> - solves dict unpacking
>>> Would it solve nested dict unpacking?
>> How do you mean? Replacing `some_name =
>> some_dict['some_key']['some_name']` with `from some_dict['some_key']
>> import some_name`?
>> Sure, why not? :)
> That is the best idea I've seem on this thread.
> And them, why having to specify the keys, just to violate DRY?
> Maybe just allwoing Mappings to be usedwith `from ... import ...` syntax
> will work nicely, unambiguously, with no new weird syntaxes introduced -
> and the syntax even allows one to rename the dict keys to other
> variables, with the
> `from mymapping import a as c, b as d " variant.
> That would be certainly nice.
Wouldn't this approach require that the keys be constants? That is, you
couldn't implement a replacement for:
val = d[key+'bar']
I'm not sure that's a reasonable restriction.
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