Remove unused imports in test modules.
diff --git a/Lib/test/test_frozen.py b/Lib/test/test_frozen.py
index 1654be0..5f72a92 100644
--- a/Lib/test/test_frozen.py
+++ b/Lib/test/test_frozen.py
@@ -2,7 +2,7 @@
 
 from test.test_support import captured_stdout, run_unittest
 import unittest
-import sys, os
+import sys
 
 class FrozenTests(unittest.TestCase):
     def test_frozen(self):