Patch #515598: removed unused import of os.
diff --git a/Lib/lib-tk/tkCommonDialog.py b/Lib/lib-tk/tkCommonDialog.py
index 32b8a8b..5d460ce 100644
--- a/Lib/lib-tk/tkCommonDialog.py
+++ b/Lib/lib-tk/tkCommonDialog.py
@@ -13,7 +13,6 @@
 #
 
 from Tkinter import *
-import os
 
 class Dialog: