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bpo-42308: Add threading.__excepthook__ (GH-23218)

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Add threading.__excepthook__ to allow retrieving the original value
of threading.excepthook in case it is set to a broken or a different
value.
This commit is contained in:
Mario Corchero 2020-11-12 18:27:44 +01:00 • committed by GitHub
parent b5cc05bbe6
commit 750c5abf43
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5 changed files with 40 additions and 0 deletions
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21
Lib/test/test_threading.py
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@ -1352,6 +1352,27 @@ class ExceptHookTests(BaseTestCase):
'Exception in threading.excepthook:\n')
self.assertEqual(err_str, 'threading_hook failed')
def test_original_excepthook(self):
def run_thread():
with support.captured_output("stderr") as output:
thread = ThreadRunFail(name="excepthook thread")
thread.start()
thread.join()
return output.getvalue()
def threading_hook(args):
print("Running a thread failed", file=sys.stderr)
default_output = run_thread()
with support.swap_attr(threading, 'excepthook', threading_hook):
custom_hook_output = run_thread()
threading.excepthook = threading.__excepthook__
recovered_output = run_thread()
self.assertEqual(default_output, recovered_output)
self.assertNotEqual(default_output, custom_hook_output)
self.assertEqual(custom_hook_output, "Running a thread failed\n")
class TimerTests(BaseTestCase):