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| # tests for slice objects; in particular the indices method.
|
| import unittest
| from test import test_support
| from cPickle import loads, dumps
|
| 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
| __hash__ = None # Silence Py3k warning
|
| 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.assertTrue(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))
| # issue 3004 tests
| self.assertEqual(slice(None, -9).indices(10), (0, 1, 1))
| self.assertEqual(slice(None, -10).indices(10), (0, 0, 1))
| self.assertEqual(slice(None, -11).indices(10), (0, 0, 1))
| self.assertEqual(slice(None, -10, -1).indices(10), (9, 0, -1))
| self.assertEqual(slice(None, -11, -1).indices(10), (9, -1, -1))
| self.assertEqual(slice(None, -12, -1).indices(10), (9, -1, -1))
| self.assertEqual(slice(None, 9).indices(10), (0, 9, 1))
| self.assertEqual(slice(None, 10).indices(10), (0, 10, 1))
| self.assertEqual(slice(None, 11).indices(10), (0, 10, 1))
| self.assertEqual(slice(None, 8, -1).indices(10), (9, 8, -1))
| self.assertEqual(slice(None, 9, -1).indices(10), (9, 9, -1))
| self.assertEqual(slice(None, 10, -1).indices(10), (9, 9, -1))
|
| 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_setslice_without_getslice(self):
| tmp = []
| class X(object):
| def __setslice__(self, i, j, k):
| tmp.append((i, j, k))
|
| x = X()
| with test_support.check_py3k_warnings():
| x[1:2] = 42
| self.assertEqual(tmp, [(1, 2, 42)])
|
| def test_pickle(self):
| s = slice(10, 20, 3)
| for protocol in (0,1,2):
| t = loads(dumps(s, protocol))
| self.assertEqual(s, t)
| self.assertEqual(s.indices(15), t.indices(15))
| self.assertNotEqual(id(s), id(t))
|
| def test_main():
| test_support.run_unittest(SliceTest)
|
| if __name__ == "__main__":
| test_main()
|
|
