8000 Avoid import-time dependency on `typing` in common cases by Sachaa-Thanasius · Pull Request #329 · python/importlib_resources · GitHub

Avoid import-time dependency on `typing` in common cases#329

Draft

Sachaa-Thanasius wants to merge 10 commits intopython:mainfrom

Sachaa-Thanasius:avoid-runtime-typing-in-common-cases

Commits on Apr 7, 2025

Create a submodule with just Traversable to begin isolating import-time usage of typing constructs (in this case, Protocol).
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Add module-level __getattr__ and TYPE_CHECKING hack to importlib_resources.abc to 1) publicly export Traversable from importlib_resources._traversable and 2) use Traversable in internal annotations…
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Now that a previously unavoidable import-time dependency on typing has been removed from importlib_resources.abc, do the same for importlib_resources._common by avoiding typing.cast and avoiding ea…
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Create a _typing submodule that lazily exports typing/annotation symbols. This will be used shortly to avoid import-time typing imports in importlib_resources_common and importlib_resources.abc.
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Adjust all annotations in importlib_resource.abc to be lazy, using the previously created _typing shim in conjunction with deferred annotations. This way, importlib_resources.abc never imports typi…
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Fix: Remove unnecessary quotes around annotation since rom __future__ import annotations is active.
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Adjust all annotations in importlib_resource._common to be lazy, using the previously created _typing shim in conjunction with deferred annotations. This way, importlib_resources._common never impo…
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Improve inspectability of modules by adding module-level __dir__ functions to complement the __getattr__ functions. Also, improve __getattr__ comments and ensure those functions have the same struc…
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Fix: Move __getattr__ shim for Anchor and Package to importlib_resources.__init__, since that's where it's eagerly imported from.
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The most controversial step: Refactor functions in importlib_resources._common to not use functools.singledispatch, since singledispatch will always import typing.
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