This definitely feels to me like though if an oddball case that "write your
own function" seems like the best solution. I accept the OP needs it, but I
have trouble imagining that many others would.
On Tue, Aug 4, 2020, 7:42 AM Dominik Vilsmeier <dominik.vilsme...@gmx.de>
wrote:
> In one of my projects I'm reusing class-level type annotations to identify
> relevant attributes for serialization, e.g. similar to the following:
>
> attrs = {name: getattr(obj, name) for name in
> get_type_hints(type(obj))}
>
> This is convenient because it merges the type annotations from the various
> stages in the class hierarchy, e.g.
>
> class Base:
> a: int
> class Derived(Base):
> b: str
>
> results in `attrs == dict(a=..., b=...)`.
>
> However it becomes inconvenient if external base classes are involved that
> define their own, unrelated type annotations, e.g.
>
> class External: # from some other distribution
> unrelated: float
> class Base(External):
> a: int
>
> It would be helpful if `get_type_hints` had a `boundary` parameter that,
> when used with a class object, determines the upper boundary for the MRO.
> So it could be used in the following way:
>
> get_type_hints(type(derived_obj), boundary=Base)
>
> to exclude any type annotations further up the class hierarchy (including
> the ones from `Base`).
>
> Regarding the implementation this would effectively skip over base classes
> in the reverse MRO until it reaches the `boundary`.
>
> What do you think?
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