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…r.map()` _process_chunk() returned a failed call's bare exception, so ProcessPoolExecutor.map() lost the _RemoteTraceback cause that _process_worker() attaches. Wrap it in _ExceptionWithTraceback. _MapResultIterator.__next__() kept the exception it raised in a local, so the exception referenced its own raising frame through its traceback. Clear the local after raising, as Future.__get_result() does.
…ceptions # Conflicts: # Lib/concurrent/futures/_base.py # Lib/test/test_concurrent_futures/executor.py
fedonman
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Executor.map()ProcessPoolExecutor.map()
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ProcessPoolExecutor.map()returned a failed call's exception without the worker traceback. The chunk worker now wraps the exception in_ExceptionWithTraceback, as_process_worker()does. The reference cycle in_MapResultIterator.__next__()that this PR also fixed was fixed on main by gh-74028.Executor.map()exceptions lose the worker traceback and form a cycle #158497