[Python-ideas] Unpacking a dict

Joao S. O. Bueno jsbueno at python.org.br
Sat May 28 13:38:05 EDT 2016

On 28 May 2016 at 14:34, Joao S. O. Bueno <jsbueno at python.org.br> 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.
>>>> Pros:
>>>> - 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.

Well, I jsut replied upon hitting the "import" suggestion for the first time.
Distinguishing it from module imports, of course, is a must.

And them, even if using another keyword than "import" (and requiring
 a specfic name after from) I stil find it much better than the proposals
introducing brackets on the LHS ,and loaded with DRY violations.

>> --
>> Zach
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