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- # tests for slice objects; in particular the indices method.
-
- import unittest
- from test import test_support
-
- import sys
-
- class SliceTest(unittest.TestCase):
-
- def test_constructor(self):
- self.assertRaises(TypeError, slice)
- self.assertRaises(TypeError, slice, 1, 2, 3, 4)
-
- def test_repr(self):
- self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)")
-
- def test_hash(self):
- # Verify clearing of SF bug #800796
- self.assertRaises(TypeError, hash, slice(5))
- self.assertRaises(TypeError, slice(5).__hash__)
-
- def test_cmp(self):
- s1 = slice(1, 2, 3)
- s2 = slice(1, 2, 3)
- s3 = slice(1, 2, 4)
- self.assertEqual(s1, s2)
- self.assertNotEqual(s1, s3)
-
- class Exc(Exception):
- pass
-
- class BadCmp(object):
- def __eq__(self, other):
- raise Exc
-
- s1 = slice(BadCmp())
- s2 = slice(BadCmp())
- self.assertRaises(Exc, cmp, s1, s2)
- self.assertEqual(s1, s1)
-
- s1 = slice(1, BadCmp())
- s2 = slice(1, BadCmp())
- self.assertEqual(s1, s1)
- self.assertRaises(Exc, cmp, s1, s2)
-
- s1 = slice(1, 2, BadCmp())
- s2 = slice(1, 2, BadCmp())
- self.assertEqual(s1, s1)
- self.assertRaises(Exc, cmp, s1, s2)
-
- def test_members(self):
- s = slice(1)
- self.assertEqual(s.start, None)
- self.assertEqual(s.stop, 1)
- self.assertEqual(s.step, None)
-
- s = slice(1, 2)
- self.assertEqual(s.start, 1)
- self.assertEqual(s.stop, 2)
- self.assertEqual(s.step, None)
-
- s = slice(1, 2, 3)
- self.assertEqual(s.start, 1)
- self.assertEqual(s.stop, 2)
- self.assertEqual(s.step, 3)
-
- class AnyClass:
- pass
-
- obj = AnyClass()
- s = slice(obj)
- self.assert_(s.stop is obj)
-
- def test_indices(self):
- self.assertEqual(slice(None ).indices(10), (0, 10, 1))
- self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2))
- self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2))
- self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1))
- self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2))
- self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2))
- self.assertEqual(
- slice(-100, 100 ).indices(10),
- slice(None).indices(10)
- )
- self.assertEqual(
- slice(100, -100, -1).indices(10),
- slice(None, None, -1).indices(10)
- )
- self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2))
-
- self.assertEqual(range(10)[::sys.maxint - 1], [0])
-
- self.assertRaises(OverflowError, slice(None).indices, 1L<<100)
-
- def test_main():
- test_support.run_unittest(SliceTest)
-
- if __name__ == "__main__":
- test_main()
-