One of the joys of having test_multiprocessing occasionally execute after
test_importlib is that it discovers special little race conditions. For
instance, it turns out that importlib would throw an exception if two different
Python processes both tried to create the __pycache__ directory as one process
would succeed, causing the other process to fail as it didn't expect to get any
"help". So now importlib simply stays calm and just accepts someone else did
the work of creating the __pycache__ directory for it, moving on with life.
Closes issue #9572.
diff --git a/Misc/NEWS b/Misc/NEWS
index ea3208c..f05f9ba 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -123,6 +123,9 @@
Library
-------
+- Issue #9572: Importlib should not raise an exception if a directory it
+ thought it needed to create was done concurrently by another process.
+
- Issue #9617: Signals received during a low-level write operation aren't
ignored by the buffered IO layer anymore.