Rip out all the u"..." literals and calls to unicode().
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index 4691e13..4cd9073 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -484,8 +484,8 @@
 
     if have_unicode:
         def test_unicode(self):
-            endcases = [unicode(''), unicode('<\\u>'), unicode('<\\\u1234>'),
-                        unicode('<\n>'),  unicode('<\\>')]
+            endcases = [str(''), str('<\\u>'), str('<\\\u1234>'),
+                        str('<\n>'),  str('<\\>')]
             for proto in protocols:
                 for u in endcases:
                     p = self.dumps(u, proto)
@@ -908,8 +908,8 @@
 class MyStr(str):
     sample = "hello"
 
-class MyUnicode(unicode):
-    sample = u"hello \u1234"
+class MyUnicode(str):
+    sample = "hello \u1234"
 
 class MyTuple(tuple):
     sample = (1, 2, 3)