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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
"""Unit tests for the memoryview
XXX We need more tests! Some tests are in test_bytes
"""
import unittest
import test.support
import sys
import gc
import weakref
class CommonMemoryTests:
#
# Tests common to direct memoryviews and sliced memoryviews
#
base_object = b"abcdef"
def check_getitem_with_type(self, tp):
b = tp(self.base_object)
oldrefcount = sys.getrefcount(b)
m = self._view(b)
self.assertEquals(m[0], b"a")
self.assert_(isinstance(m[0], bytes), type(m[0]))
self.assertEquals(m[5], b"f")
self.assertEquals(m[-1], b"f")
self.assertEquals(m[-6], b"a")
# Bounds checking
self.assertRaises(IndexError, lambda: m[6])
self.assertRaises(IndexError, lambda: m[-7])
self.assertRaises(IndexError, lambda: m[sys.maxsize])
self.assertRaises(IndexError, lambda: m[-sys.maxsize])
# Type checking
self.assertRaises(TypeError, lambda: m[None])
self.assertRaises(TypeError, lambda: m[0.0])
self.assertRaises(TypeError, lambda: m["a"])
m = None
self.assertEquals(sys.getrefcount(b), oldrefcount)
def test_getitem_readonly(self):
self.check_getitem_with_type(bytes)
def test_getitem_writable(self):
self.check_getitem_with_type(bytearray)
def test_setitem_readonly(self):
b = self.base_object
oldrefcount = sys.getrefcount(b)
m = self._view(b)
def setitem(value):
m[0] = value
self.assertRaises(TypeError, setitem, b"a")
self.assertRaises(TypeError, setitem, 65)
self.assertRaises(TypeError, setitem, memoryview(b"a"))
m = None
self.assertEquals(sys.getrefcount(b), oldrefcount)
def test_setitem_writable(self):
b = bytearray(self.base_object)
oldrefcount = sys.getrefcount(b)
m = self._view(b)
m[0] = b"0"
self._check_contents(b, b"0bcdef")
m[1:3] = b"12"
self._check_contents(b, b"012def")
m[1:1] = b""
self._check_contents(b, b"012def")
m[:] = b"abcdef"
self._check_contents(b, b"abcdef")
# Overlapping copies of a view into itself
m[0:3] = m[2:5]
self._check_contents(b, b"cdedef")
m[:] = b"abcdef"
m[2:5] = m[0:3]
self._check_contents(b, b"ababcf")
def setitem(key, value):
m[key] = value
# Bounds checking
self.assertRaises(IndexError, setitem, 6, b"a")
self.assertRaises(IndexError, setitem, -7, b"a")
self.assertRaises(IndexError, setitem, sys.maxsize, b"a")
self.assertRaises(IndexError, setitem, -sys.maxsize, b"a")
# Wrong index/slice types
self.assertRaises(TypeError, setitem, 0.0, b"a")
self.assertRaises(TypeError, setitem, (0,), b"a")
self.assertRaises(TypeError, setitem, "a", b"a")
# Trying to resize the memory object
self.assertRaises(ValueError, setitem, 0, b"")
self.assertRaises(ValueError, setitem, 0, b"ab")
self.assertRaises(ValueError, setitem, slice(1,1), b"a")
self.assertRaises(ValueError, setitem, slice(0,2), b"a")
m = None
self.assertEquals(sys.getrefcount(b), oldrefcount)
def test_len(self):
self.assertEquals(len(self._view(self.base_object)), 6)
def test_tobytes(self):
m = self._view(self.base_object)
b = m.tobytes()
self.assertEquals(b, b"abcdef")
self.assert_(isinstance(b, bytes), type(b))
def test_tolist(self):
m = self._view(self.base_object)
l = m.tolist()
self.assertEquals(l, list(b"abcdef"))
def test_compare(self):
# memoryviews can compare for equality with other objects
# having the buffer interface.
m = self._view(self.base_object)
for tp in (bytes, bytearray):
self.assertTrue(m == tp(b"abcdef"))
self.assertFalse(m != tp(b"abcdef"))
self.assertFalse(m == tp(b"abcde"))
self.assertTrue(m != tp(b"abcde"))
self.assertFalse(m == tp(b"abcde1"))
self.assertTrue(m != tp(b"abcde1"))
self.assertTrue(m == m)
self.assertTrue(m == m[:])
self.assertTrue(m[0:6] == m[:])
self.assertFalse(m[0:5] == m)
# Comparison with objects which don't support the buffer API
self.assertFalse(m == "abc")
self.assertTrue(m != "abc")
self.assertFalse("abc" == m)
self.assertTrue("abc" != m)
# Unordered comparisons
for c in (m, b"abcdef"):
self.assertRaises(TypeError, lambda: m < c)
self.assertRaises(TypeError, lambda: c <= m)
self.assertRaises(TypeError, lambda: m >= c)
self.assertRaises(TypeError, lambda: c > m)
def check_attributes_with_type(self, tp):
b = tp(self.base_object)
m = self._view(b)
self.assertEquals(m.format, 'B')
self.assertEquals(m.itemsize, 1)
self.assertEquals(m.ndim, 1)
self.assertEquals(m.shape, (6,))
self.assertEquals(m.size, 6)
self.assertEquals(m.strides, (1,))
self.assertEquals(m.suboffsets, None)
return m
def test_attributes_readonly(self):
m = self.check_attributes_with_type(bytes)
self.assertEquals(m.readonly, True)
def test_attributes_writable(self):
m = self.check_attributes_with_type(bytearray)
self.assertEquals(m.readonly, False)
def test_getbuffer(self):
# Test PyObject_GetBuffer() on a memoryview object.
b = self.base_object
oldrefcount = sys.getrefcount(b)
m = self._view(b)
oldviewrefcount = sys.getrefcount(m)
s = str(m, "utf-8")
self._check_contents(b, s.encode("utf-8"))
self.assertEquals(sys.getrefcount(m), oldviewrefcount)
m = None
self.assertEquals(sys.getrefcount(b), oldrefcount)
def test_gc(self):
class MyBytes(bytes):
pass
class MyObject:
pass
# Create a reference cycle through a memoryview object
b = MyBytes(b'abc')
m = self._view(b)
o = MyObject()
b.m = m
b.o = o
wr = weakref.ref(o)
b = m = o = None
# The cycle must be broken
gc.collect()
self.assert_(wr() is None, wr())
class MemoryviewTest(unittest.TestCase, CommonMemoryTests):
def _view(self, obj):
return memoryview(obj)
def _check_contents(self, obj, contents):
self.assertEquals(obj, contents)
def test_constructor(self):
ob = b'test'
self.assert_(memoryview(ob))
self.assert_(memoryview(object=ob))
self.assertRaises(TypeError, memoryview)
self.assertRaises(TypeError, memoryview, ob, ob)
self.assertRaises(TypeError, memoryview, argument=ob)
self.assertRaises(TypeError, memoryview, ob, argument=True)
class MemorySliceTest(unittest.TestCase, CommonMemoryTests):
base_object = b"XabcdefY"
def _view(self, obj):
m = memoryview(obj)
return m[1:7]
def _check_contents(self, obj, contents):
self.assertEquals(obj[1:7], contents)
def test_refs(self):
m = memoryview(b"ab")
oldrefcount = sys.getrefcount(m)
m[1:2]
self.assertEquals(sys.getrefcount(m), oldrefcount)
class MemorySliceSliceTest(unittest.TestCase, CommonMemoryTests):
base_object = b"XabcdefY"
def _view(self, obj):
m = memoryview(obj)
return m[:7][1:]
def _check_contents(self, obj, contents):
self.assertEquals(obj[1:7], contents)
def test_main():
test.support.run_unittest(
MemoryviewTest, MemorySliceTest, MemorySliceSliceTest)
if __name__ == "__main__":
test_main()
|
