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-rw-r--r--Lib/test/test_threading.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 0d43d42..8737c3d 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -350,7 +350,7 @@ class ThreadTests(BaseTestCase):
t.start()
t.join()
l = enum()
- self.assertFalse(t in l,
+ self.assertNotIn(t, l,
"#1703448 triggered after %d trials: %s" % (i, l))
finally:
sys.setswitchinterval(old_interval)