summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_slice.py
blob: 854805b91551000386f4063732ea239d0b8f4d23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
# 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.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))
        # 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()
        x[1:2] = 42
        self.assertEquals(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()