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/pysource.py b/Tools/scripts/pysource.py
index 71e0ded..98a78f0 100644
--- a/Tools/scripts/pysource.py
+++ b/Tools/scripts/pysource.py
@@ -33,7 +33,7 @@
 def _open(fullpath):
     try:
         size = os.stat(fullpath).st_size
-    except OSError, err: # Permission denied - ignore the file
+    except OSError as err: # Permission denied - ignore the file
         print_debug("%s: permission denied: %s" % (fullpath, err))
         return None
 
@@ -43,7 +43,7 @@
 
     try:
         return open(fullpath, 'rU')
-    except IOError, err: # Access denied, or a special file - ignore it
+    except IOError as err: # Access denied, or a special file - ignore it
         print_debug("%s: access denied: %s" % (fullpath, err))
         return None
 
@@ -81,7 +81,7 @@
 
     try:
         compile(code, fullpath, "exec")
-    except Exception, err:
+    except Exception as err:
         print_debug("%s: cannot compile: %s" % (fullpath, err))
         return False