Mercurial > cpython-lru_cache-weakref
diff Lib/test/test_array.py @ 42951:9620134010a5 legacy-trunk
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.
| author | Thomas Wouters <thomas@python.org> |
|---|---|
| date | Tue, 28 Aug 2007 15:28:19 +0000 |
| parents | ef5d3e539384 |
| children | 1d84bf5f9478 |
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--- a/Lib/test/test_array.py Tue Aug 28 12:31:09 2007 +0000 +++ b/Lib/test/test_array.py Tue Aug 28 15:28:19 2007 +0000 @@ -474,6 +474,18 @@ array.array(self.typecode) ) + def test_extended_getslice(self): + # Test extended slicing by comparing with list slicing + # (Assumes list conversion works correctly, too) + a = array.array(self.typecode, self.example) + indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100) + for start in indices: + for stop in indices: + # Everything except the initial 0 (invalid step) + for step in indices[1:]: + self.assertEqual(list(a[start:stop:step]), + list(a)[start:stop:step]) + def test_setslice(self): a = array.array(self.typecode, self.example) a[:1] = a @@ -557,12 +569,34 @@ a = array.array(self.typecode, self.example) self.assertRaises(TypeError, a.__setslice__, 0, 0, None) + self.assertRaises(TypeError, a.__setitem__, slice(0, 0), None) self.assertRaises(TypeError, a.__setitem__, slice(0, 1), None) b = array.array(self.badtypecode()) self.assertRaises(TypeError, a.__setslice__, 0, 0, b) + self.assertRaises(TypeError, a.__setitem__, slice(0, 0), b) self.assertRaises(TypeError, a.__setitem__, slice(0, 1), b) + def test_extended_set_del_slice(self): + indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100) + for start in indices: + for stop in indices: + # Everything except the initial 0 (invalid step) + for step in indices[1:]: + a = array.array(self.typecode, self.example) + L = list(a) + # Make sure we have a slice of exactly the right length, + # but with (hopefully) different data. + data = L[start:stop:step] + data.reverse() + L[start:stop:step] = data + a[start:stop:step] = array.array(self.typecode, data) + self.assertEquals(a, array.array(self.typecode, L)) + + del L[start:stop:step] + del a[start:stop:step] + self.assertEquals(a, array.array(self.typecode, L)) + def test_index(self): example = 2*self.example a = array.array(self.typecode, example)