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[3.12] gh-130250: use support.swap_attr() in test and don't assume we're beginning with a clean system state (GH-130342) (#130345)

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gh-130250: use support.swap_attr() in test and don't assume we're beginning with a clean system state (GH-130342)
(cherry picked from commit 048ee2d5ec)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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Miss Islington (bot) 2025-02-20 12:45:42 +01:00 • committed by GitHub
parent b259b7577f
commit 96a914ad7e
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1 changed files with 1 additions and 5 deletions
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6
Lib/test/test_traceback.py
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@ -329,14 +329,10 @@ class TracebackCases(unittest.TestCase):
self.assertEqual(output.getvalue(), "Exception: projector\n")
def test_print_last(self):
self.assertIsNone(getattr(sys, "last_exc", None))
try:
sys.last_exc = ValueError(42)
with support.swap_attr(sys, 'last_exc', ValueError(42)):
output = StringIO()
traceback.print_last(file=output)
self.assertEqual(output.getvalue(), "ValueError: 42\n")
finally:
sys.last_exc = None
def test_format_exception_exc(self):
e = Exception("projector")