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ProcessPoolExecutor workers will hold the return value of their last task in memory until the next task is received. Since the return value has already been propagated to the parent process's Future (or has been discarded by this point), the object can be safely released.
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Misc/NEWS.d/next/Library/2019-01-11-08-47-58.bpo-35715.Wi3gl0.rst
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Librates the return value of a ProcessPoolExecutor _process_worker after it's no longer needed to free memory |