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

Lib/test/string_tests.py

@@ -970,7 +970,7 @@ class MixinStrUnicodeUserStringTest:
             def f():
                 yield 4 + ""
             self.fixtype(' ').join(f())
-        except TypeError, e:
+        except TypeError as e:
             if '+' not in str(e):
                 self.fail('join() ate exception message')
         else: