Index: lib2to3/main.py
===================================================================
--- lib2to3/main.py	(revision 74264)
+++ lib2to3/main.py	(working copy)
@@ -54,14 +54,18 @@
         if not self.nobackups:
             shutil.copymode(backup, filename)
 
-    def print_output(self, old, new, filename, equal):
+    def print_output(self, old, new, filename, equal, encoding):
         if equal:
             self.log_message("No changes to %s", filename)
         else:
             self.log_message("Refactored %s", filename)
             if self.show_diffs:
+                if sys.stdout.encoding != None:
+                    encoding = sys.stdout.encoding
+                if encoding == None:
+                    encoding = "ascii"
                 for line in diff_texts(old, new, filename):
-                    print line
+                    print line.encode(encoding)
 
 
 def warn(msg):
Index: lib2to3/refactor.py
===================================================================
--- lib2to3/refactor.py	(revision 74264)
+++ lib2to3/refactor.py	(working copy)
@@ -262,7 +262,7 @@
             msg = msg % args
         self.logger.debug(msg)
 
-    def print_output(self, old_text, new_text, filename, equal):
+    def print_output(self, old_text, new_text, filename, equal, encoding):
         """Called with the old version, new version, and filename of a
         refactored file."""
         pass
@@ -429,7 +429,7 @@
             if old_text is None:
                 return
         equal = old_text == new_text
-        self.print_output(old_text, new_text, filename, equal)
+        self.print_output(old_text, new_text, filename, equal, encoding)
         if equal:
             self.log_debug("No changes to %s", filename)
             return
Index: lib2to3/tests/test_refactor.py
===================================================================
--- lib2to3/tests/test_refactor.py	(revision 74264)
+++ lib2to3/tests/test_refactor.py	(working copy)
@@ -151,8 +151,10 @@
 
         class MyRT(refactor.RefactoringTool):
 
-            def print_output(self, old_text, new_text, filename, equal):
-                results.extend([old_text, new_text, filename, equal])
+            def print_output(self, old_text, new_text, filename, equal,
+                             encoding):
+                results.extend([old_text, new_text, filename, equal,
+                                encoding])
 
         results = []
         rt = MyRT(_DEFAULT_FIXERS)
@@ -164,7 +166,7 @@
             sys.stdin = save
         expected = ["def parrot(): pass\n\n",
                     "def cheese(): pass\n\n",
-                    "<stdin>", False]
+                    "<stdin>", False, None]
         self.assertEqual(results, expected)
 
     def check_file_refactoring(self, test_file, fixers=_2TO3_FIXERS):