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/site.py b/Lib/site.py
index 1513818..5b03b5e 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -391,7 +391,7 @@
         import sitecustomize
     except ImportError:
         pass
-    except Exception, err:
+    except Exception as err:
         if os.environ.get("PYTHONVERBOSE"):
             raise
         sys.stderr.write(