Sync with importlib_metadata for Python 3.16
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研究方向
Read the upstream importlib_metadata 9.0.1 and 9.1.0 changelogs linked in the issue, then compare their changes with Lib/importlib/metadata and its tests. Check each listed behavior and cleanup against the current Python 3.16 implementation; done when the applicable upstream changes are reflected and the relevant tests pass. The issue names _typing.py but does not identify specific test files.
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描述
Tracking issue for applying importlib_metadata changes to importlib.metadata in 3.16, continuing the pattern of #132947 (3.15) and #117089 (3.13).
This covers importlib_metadata 9.0.1 and 9.1.0:
- Prefer the greater metadata directory when a path supplies more than one. Children are now considered in reverse lexicographic order, so stale metadata left behind by an interrupted or unclean upgrade no longer shadows the version in use (#100666).
- Identify the distribution when a required metadata field is missing.
Distribution.nameand.versionnow raise aKeyErrornaming both the field and the distribution, andPathDistributionrenders itself as its metadata path. - Defer
EntryPoint.valuevalidation until use. Construction no longer validates, so one malformed entry point no longer prevents entry points in other groups from being selected (python/importlib_metadata#523). importlib.metadata.diagnoseno longer crashes on a metadata directory with no metadata file, or whose metadata declares no name; such distributions are reported by their location (python/importlib_metadata#548).SimplePath.joinpathandSimplePath.__truediv__takeotherpositional-only, sopathlib.Pathsatisfies the protocol under type checkers that compare parameter names (python/importlib_metadata#542).
Two further items that are cleanups rather than behavior changes:
Prepared.normalizereturns to there.subimplementation. The hand-rolled version from #143658 was reverted upstream, so keeping it here would be fresh drift.Lib/importlib/metadata/_typing.pyis removed along with its import. Its only export,md_none, lost its last call site whenDistribution.metadatabegan raisingMetadataNotFound(#143387), but the import line survived the merge that landed that change, leaving an unused module imported by nothing.
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- gh-160387
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