Remove the ability to slice/index on exceptions per PEP 352.

Lib/test/test_exceptions.py

@@ -302,13 +302,6 @@ class ExceptionTests(unittest.TestCase):
                                               'pickled "%r", attribute "%s' %
                                               (e, checkArgName))
 
-    def testSlicing(self):
-        # Test that you can slice an exception directly instead of requiring
-        # going through the 'args' attribute.
-        args = (1, 2, 3)
-        exc = BaseException(*args)
-        self.failUnlessEqual(exc[:], args)
-
     def testKeywordArgs(self):
         # test that builtin exception don't take keyword args,
         # but user-defined subclasses can if they want