Remove unused imports in test modules.
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py
index ce07efc..b4998b9 100644
--- a/Lib/test/test_random.py
+++ b/Lib/test/test_random.py
@@ -5,7 +5,7 @@
 import time
 import pickle
 import warnings
-from math import log, exp, sqrt, pi, fsum, sin
+from math import log, exp, pi, fsum, sin
 from functools import reduce
 from test import test_support