Remove string.{letters,lowercase,uppercase}.
diff --git a/Lib/test/test_string.py b/Lib/test/test_string.py
index ab75f8c..3b21ebc 100644
--- a/Lib/test/test_string.py
+++ b/Lib/test/test_string.py
@@ -6,9 +6,9 @@
 
     def test_attrs(self):
         string.whitespace
-        string.lowercase
-        string.uppercase
-        string.letters
+        string.ascii_lowercase
+        string.ascii_uppercase
+        string.ascii_letters
         string.digits
         string.hexdigits
         string.octdigits