Remove unnecessary line.
diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index dc0cc6f..de775dc 100644
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -579,7 +579,6 @@
 
 def test_main(verbose=None):
     import sys
-    from test import test_sets
     test_classes = (
         TestBasic,
         TestVariousIteratorArgs,