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gh-139899: Introduce MetaPathFinder.discover and PathEntryFinder.discover
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gh-139899: Introduce MetaPathFinder.discover and PathEntryFinder.discover
#139900
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gh-139899: Introduce MetaPathFinder.discover and PathEntryFinder.discover
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Fix doc reference
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Fix docstrings
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Fix news references
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Raise ValueError on invalid parent
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Dedupe __path__ in PathFinder.discover
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Use context manager and add error handling to os.scandir
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Raise ValueError on invalid parent
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Dedupe when package exists with multiple suffixes
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Add tests
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Merge branch 'main' into gh-139899
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