>
> On 22 May 2019, at 11:35, Bernat Gabor <gaborjbernat@gmail.com> wrote:
>
> I like to where this is going. Plus one from me. I assume the main users of this annotated metadata will be typing checker(s) plugins?
> (…)

Not necessarily. Mentioned in the PEP is a possible struct module runtime
integration. I co-maintain Injector[1], a dependency injection framework, and
It could also use the extra metadata at runtime. Currently one declares a
constructor mixing injectable and non-injectable parameters like this:

        @inject
        @noninjectable(‘value’)
        def __init__(self, service: Service, value: Value):

This PEP would make the following possible while reducing repetition
somewhat and improving editor integration:

        @inject
        def __init__(self, service: Service, value: Assisted[Value]):

Or even (remains to be seen which is better, maybe both could coexist):

        def __init__(self, service: Inject[Service], value: Value):

(Assisted and Inject are hypothetical generic aliases).

Best,
Jakub

[1] https://github.com/alecthomas/injector

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