Improve extended slicing support in builtin types and classes. Specifically:

 - Specialcase extended slices that amount to a shallow copy the same way as
   is done for simple slices, in the tuple, string and unicode case.

 - Specialcase step-1 extended slices to optimize the common case for all
   involved types.

 - For lists, allow extended slice assignment of differing lengths as long
   as the step is 1. (Previously, 'l[:2:1] = []' failed even though
   'l[:2] = []' and 'l[:2:None] = []' do not.)

 - Implement extended slicing for buffer, array, structseq, mmap and
   UserString.UserString.

 - Implement slice-object support (but not non-step-1 slice assignment) for
   UserString.MutableString.

 - Add tests for all new functionality.

1 files changed, 2 insertions, 0 deletions

diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py
index 7c6623a..1c799d7 100644
--- a/Lib/test/list_tests.py
+++ b/Lib/test/list_tests.py
@@ -179,8 +179,10 @@ class CommonTest(seq_tests.CommonTest):
         self.assertEqual(a, self.type2test(range(10)))
 
         self.assertRaises(TypeError, a.__setslice__, 0, 1, 5)
+        self.assertRaises(TypeError, a.__setitem__, slice(0, 1, 5))
 
         self.assertRaises(TypeError, a.__setslice__)
+        self.assertRaises(TypeError, a.__setitem__)
 
     def test_delslice(self):
         a = self.type2test([0, 1])