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-rw-r--r--Lib/test/test_copy.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py
index 2df0deb..732b4f4 100644
--- a/Lib/test/test_copy.py
+++ b/Lib/test/test_copy.py
@@ -627,7 +627,7 @@ class TestCopy(unittest.TestCase):
x, y = C(), C()
# The underlying containers are decoupled
v[x] = y
- self.assertFalse(x in u)
+ self.assertNotIn(x, u)
def test_copy_weakkeydict(self):
self._check_copy_weakdict(weakref.WeakKeyDictionary)