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gh-91577: SharedMemory move imports out of methods
SharedMemory.unlink() uses the unregister() function from resource_tracker. Previously it was imported in the method, but this can fail if the method is called during interpreter shutdown, for example when unlink is part of a __del__() method. Moving the import to the top of the file, means that the unregister() method is available during interpreter shutdown. The register call in SharedMemory.__init__() can also use this imported resource_tracker.
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Misc/NEWS.d/next/Library/2022-04-15-17-38-55.gh-issue-91577.Ah7cLL.rst
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Move imports in :class:`~multiprocessing.SharedMemory` methods to module level so that they can be executed late in python finalization. |