Use floor division operator.
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index a4cbfc5..01dded6 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -1241,7 +1241,7 @@
     def __iter__(self):
         return self
     def next(self):
-        3/0
+        3 // 0
 
 class S:
     'Test immediate stop'