use assert[Not]In where appropriate
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index a8b29fc..ac155c9 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -434,10 +434,10 @@
         float.__setformat__('float', self.save_formats['float'])
 
     def test_getformat(self):
-        self.assertTrue(float.__getformat__('double') in
-                     ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
-        self.assertTrue(float.__getformat__('float') in
-                     ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
+        self.assertIn(float.__getformat__('double'),
+                      ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
+        self.assertIn(float.__getformat__('float'),
+                      ['unknown', 'IEEE, big-endian', 'IEEE, little-endian'])
         self.assertRaises(ValueError, float.__getformat__, 'chicken')
         self.assertRaises(TypeError, float.__getformat__, 1)