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

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- 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.
This commit is contained in:
Thomas Wouters 2007-08-28 15:28:19 +00:00
parent 0f4a14b56f
commit 3ccec68a05
16 changed files with 730 additions and 120 deletions
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2
Lib/test/list_tests.py
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@ -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])