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/Lib/idlelib/GrepDialog.py b/Lib/idlelib/GrepDialog.py
index ab136bc..99d2e4d 100644
--- a/Lib/idlelib/GrepDialog.py
+++ b/Lib/idlelib/GrepDialog.py
@@ -82,7 +82,7 @@
         for fn in list:
             try:
                 f = open(fn)
-            except IOError, msg:
+            except IOError as msg:
                 print msg
                 continue
             lineno = 0
@@ -110,7 +110,7 @@
     def findfiles(self, dir, base, rec):
         try:
             names = os.listdir(dir or os.curdir)
-        except os.error, msg:
+        except os.error as msg:
             print msg
             return []
         list = []