Ran 2to3 over scripts directory.
diff --git a/Tools/scripts/pickle2db.py b/Tools/scripts/pickle2db.py
index 86545cc..c66f5e9 100644
--- a/Tools/scripts/pickle2db.py
+++ b/Tools/scripts/pickle2db.py
@@ -128,7 +128,7 @@
         sys.stderr.write("Check for format or version mismatch.\n")
         return 1
     else:
-        for k in db.keys():
+        for k in list(db.keys()):
             del db[k]
 
     while 1: