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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 0b37059..0d43d42 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -153,7 +153,7 @@ class ThreadTests(BaseTestCase):
tid = _thread.start_new_thread(f, (mutex,))
# Wait for the thread to finish.
mutex.acquire()
- self.assertTrue(tid in threading._active)
+ self.assertIn(tid, threading._active)
self.assertTrue(isinstance(threading._active[tid],
threading._DummyThread))
del threading._active[tid]