1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/idlelib/TreeWidget.py b/Lib/idlelib/TreeWidget.py
index c5084101ba..0009de8763 100644
--- a/Lib/idlelib/TreeWidget.py
+++ b/Lib/idlelib/TreeWidget.py
@@ -398,7 +398,7 @@ class FileTreeItem(TreeItem):
             names = os.listdir(self.path)
         except os.error:
             return []
-        names.sort(lambda a, b: cmp(os.path.normcase(a), os.path.normcase(b)))
+        names.sort(key = os.path.normcase)
         sublist = []
         for name in names:
             item = FileTreeItem(os.path.join(self.path, name))