SF patch 1631942 by Collin Winter:
(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block
diff --git a/Tools/scripts/treesync.py b/Tools/scripts/treesync.py
index 4fb1798..a7a2098 100755
--- a/Tools/scripts/treesync.py
+++ b/Tools/scripts/treesync.py
@@ -78,7 +78,7 @@
         print "creating slave directory", slave
         try:
             os.mkdir(slave)
-        except os.error, msg:
+        except os.error as msg:
             print "can't make slave directory", slave, ":", msg
             return
         else: