| 1 | # tests for slice objects; in particular the indices method.
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| 2 |
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| 3 | import unittest
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| 4 | from test import test_support
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| 5 | from cPickle import loads, dumps
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| 6 |
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| 7 | import sys
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| 8 |
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| 9 | class SliceTest(unittest.TestCase):
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| 10 |
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| 11 | def test_constructor(self):
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| 12 | self.assertRaises(TypeError, slice)
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| 13 | self.assertRaises(TypeError, slice, 1, 2, 3, 4)
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| 14 |
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| 15 | def test_repr(self):
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| 16 | self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)")
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| 17 |
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| 18 | def test_hash(self):
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| 19 | # Verify clearing of SF bug #800796
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| 20 | self.assertRaises(TypeError, hash, slice(5))
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| 21 | self.assertRaises(TypeError, slice(5).__hash__)
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| 22 |
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| 23 | def test_cmp(self):
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| 24 | s1 = slice(1, 2, 3)
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| 25 | s2 = slice(1, 2, 3)
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| 26 | s3 = slice(1, 2, 4)
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| 27 | self.assertEqual(s1, s2)
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| 28 | self.assertNotEqual(s1, s3)
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| 29 |
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| 30 | class Exc(Exception):
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| 31 | pass
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| 32 |
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| 33 | class BadCmp(object):
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| 34 | def __eq__(self, other):
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| 35 | raise Exc
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| 36 | __hash__ = None # Silence Py3k warning
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| 37 |
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| 38 | s1 = slice(BadCmp())
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| 39 | s2 = slice(BadCmp())
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| 40 | self.assertRaises(Exc, cmp, s1, s2)
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| 41 | self.assertEqual(s1, s1)
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| 42 |
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| 43 | s1 = slice(1, BadCmp())
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| 44 | s2 = slice(1, BadCmp())
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| 45 | self.assertEqual(s1, s1)
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| 46 | self.assertRaises(Exc, cmp, s1, s2)
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| 47 |
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| 48 | s1 = slice(1, 2, BadCmp())
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| 49 | s2 = slice(1, 2, BadCmp())
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| 50 | self.assertEqual(s1, s1)
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| 51 | self.assertRaises(Exc, cmp, s1, s2)
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| 52 |
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| 53 | def test_members(self):
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| 54 | s = slice(1)
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| 55 | self.assertEqual(s.start, None)
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| 56 | self.assertEqual(s.stop, 1)
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| 57 | self.assertEqual(s.step, None)
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| 58 |
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| 59 | s = slice(1, 2)
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| 60 | self.assertEqual(s.start, 1)
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| 61 | self.assertEqual(s.stop, 2)
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| 62 | self.assertEqual(s.step, None)
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| 63 |
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| 64 | s = slice(1, 2, 3)
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| 65 | self.assertEqual(s.start, 1)
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| 66 | self.assertEqual(s.stop, 2)
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| 67 | self.assertEqual(s.step, 3)
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| 68 |
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| 69 | class AnyClass:
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| 70 | pass
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| 71 |
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| 72 | obj = AnyClass()
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| 73 | s = slice(obj)
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| 74 | self.assertTrue(s.stop is obj)
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| 75 |
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| 76 | def test_indices(self):
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| 77 | self.assertEqual(slice(None ).indices(10), (0, 10, 1))
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| 78 | self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2))
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| 79 | self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2))
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| 80 | self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1))
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| 81 | self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2))
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| 82 | self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2))
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| 83 | # issue 3004 tests
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| 84 | self.assertEqual(slice(None, -9).indices(10), (0, 1, 1))
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| 85 | self.assertEqual(slice(None, -10).indices(10), (0, 0, 1))
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| 86 | self.assertEqual(slice(None, -11).indices(10), (0, 0, 1))
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| 87 | self.assertEqual(slice(None, -10, -1).indices(10), (9, 0, -1))
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| 88 | self.assertEqual(slice(None, -11, -1).indices(10), (9, -1, -1))
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| 89 | self.assertEqual(slice(None, -12, -1).indices(10), (9, -1, -1))
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| 90 | self.assertEqual(slice(None, 9).indices(10), (0, 9, 1))
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| 91 | self.assertEqual(slice(None, 10).indices(10), (0, 10, 1))
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| 92 | self.assertEqual(slice(None, 11).indices(10), (0, 10, 1))
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| 93 | self.assertEqual(slice(None, 8, -1).indices(10), (9, 8, -1))
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| 94 | self.assertEqual(slice(None, 9, -1).indices(10), (9, 9, -1))
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| 95 | self.assertEqual(slice(None, 10, -1).indices(10), (9, 9, -1))
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| 96 |
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| 97 | self.assertEqual(
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| 98 | slice(-100, 100 ).indices(10),
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| 99 | slice(None).indices(10)
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| 100 | )
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| 101 | self.assertEqual(
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| 102 | slice(100, -100, -1).indices(10),
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| 103 | slice(None, None, -1).indices(10)
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| 104 | )
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| 105 | self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2))
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| 106 |
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| 107 | self.assertEqual(range(10)[::sys.maxint - 1], [0])
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| 108 |
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| 109 | self.assertRaises(OverflowError, slice(None).indices, 1L<<100)
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| 110 |
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| 111 | def test_setslice_without_getslice(self):
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| 112 | tmp = []
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| 113 | class X(object):
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| 114 | def __setslice__(self, i, j, k):
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| 115 | tmp.append((i, j, k))
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| 116 |
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| 117 | x = X()
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| 118 | with test_support.check_py3k_warnings():
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| 119 | x[1:2] = 42
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| 120 | self.assertEqual(tmp, [(1, 2, 42)])
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| 121 |
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| 122 | def test_pickle(self):
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| 123 | s = slice(10, 20, 3)
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| 124 | for protocol in (0,1,2):
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| 125 | t = loads(dumps(s, protocol))
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| 126 | self.assertEqual(s, t)
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| 127 | self.assertEqual(s.indices(15), t.indices(15))
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| 128 | self.assertNotEqual(id(s), id(t))
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| 129 |
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| 130 | def test_main():
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| 131 | test_support.run_unittest(SliceTest)
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| 132 |
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| 133 | if __name__ == "__main__":
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| 134 | test_main()
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