bpo-37261: Document sys.unraisablehook corner cases (GH-14059)
Document reference cycle and resurrected objects issues in
sys.unraisablehook() and threading.excepthook() documentation.
Fix test.support.catch_unraisable_exception(): __exit__() no longer
ignores unraisable exceptions.
Fix test_io test_writer_close_error_on_close(): use a second
catch_unraisable_exception() to catch the BufferedWriter unraisable
exception.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 55686d7..fc474c9 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -2072,8 +2072,12 @@
writer.close = lambda: None
writer = None
+ # Ignore BufferedWriter (of the BufferedRWPair) unraisable exception
with support.catch_unraisable_exception():
- pair = None
+ # Ignore BufferedRWPair unraisable exception
+ with support.catch_unraisable_exception():
+ pair = None
+ support.gc_collect()
support.gc_collect()
def test_reader_writer_close_error_on_close(self):