> On 3 Sep 2019, at 14:56, Paul Moore <p.f.mo...@gmail.com> wrote:
>
> On Tue, 3 Sep 2019 at 13:38, None via Python-ideas
> <python-ideas@python.org> wrote:
>
>> I really believe that a nested key retrieval mechanism should be a
>> first-class offering of the standard library. It is extremely common in the
>> Python ecosystem to find developers working with data sets comprised of
>> nested data structures. Serializing and deserializing JSON is one of the
>> most common functions developers do today, too. As this is a common task
>> being performed by hundreds of thousands of developers, wouldn't it better
>> if we had one canonical way to do it (in the spirit of PEP-20 and having one
>> obvious way to do things)?
>
> There's a PyPI package, glom (https://pypi.org/project/glom/) that
> appears to do what you are after, as well as a lot more. Maybe that is
> something you should look into.
There are many more similar too.
There's one in tri.declarative:
https://trideclarative.readthedocs.io/en/latest/#get-set-attribute-given-a-path-string
<https://trideclarative.readthedocs.io/en/latest/#get-set-attribute-given-a-path-string>
There's one in pyrsistent: https://github.com/tobgu/pyrsistent#transformations
<https://github.com/tobgu/pyrsistent#transformations> (the docs mostly talk
about the transformation part because it's the thing you probably want in
pyrsistent).
I agree fully with your point that use cases differ so the functions will
differ. In glom the paths are "a.b.c", in tri.declarative they are "a__b__c"
and in pyrsistent they are ['a', 'b', 'c']. All three makes sense from their
respective use cases, and they can't be unified.
/ Anders
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