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bpo-42382: In importlib.metadata, EntryPoint objects now expose dist (#23758)

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* bpo-42382: In importlib.metadata, `EntryPoint` objects now expose a `.dist` object referencing the `Distribution` when constructed from a `Distribution`.

Also, sync importlib_metadata 3.3:

- Add support for package discovery under package normalization rules.
- The object returned by `metadata()` now has a formally-defined protocol called `PackageMetadata` with declared support for the `.get_all()` method.

* Add blurb

* Remove latent footnote.
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Jason R. Coombs 2020-12-31 12:56:43 -05:00 • committed by GitHub
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In ``importlib.metadata``: - ``EntryPoint`` objects now expose a ``.dist``
object referencing the ``Distribution`` when constructed from a
``Distribution``. - Add support for package discovery under package
normalization rules. - The object returned by ``metadata()`` now has a
formally-defined protocol called ``PackageMetadata`` with declared support
for the ``.get_all()`` method. - Synced with importlib_metadata 3.3.