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How should we annotate functions that forward to their superclass?

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
tooling

Research direction

No implementation files, tests, or entry points are named. Start by reading the proposed SuperKwargs behavior and related mypy issue #8769; the issue needs an agreed design for forwarded and synthesized parameters before implementation can be scoped.

Written by the indexing model from the issue text.

Description

topic: feature

Consider this real code:

from typing import SuperKwargs

class InferenceManager(Generic[T]):
    @override
    def __init__(self,
                 *,
                 default_trajectory: T,
                 progress_manager: None | ProgressManager,
                 wandb_run: None | Run
                 ) -> None:
        super().__init__()
        self._progress_manager = progress_manager
        self._results: list[T] = []
        self._trajectory = default_trajectory
        self._wandb_run = wandb_run


class TrainingInferenceManager(InferenceManager[RLTrainingResult]):
    def __init__(self, training_result: TrainingResult, **kwargs: SuperKwargs):
         self.training_result = training_result
         super().__init__(**kwargs)

If we want full annotations for TrainingInferenceManager.__init__, we currently need to duplicate all of the superclass's parameters. I suggest adding typing.SuperKwargs that stands in place of them.

(This could be made more complicated by allowing the child class to synthesize some of the parameters.)

Related: https://github.com/python/mypy/issues/8769

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Merged PRs (30d)
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