Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_memoryview.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 3c9232a684ae
children 215690b782f8
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rev   line source
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1 """Unit tests for the memoryview
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2
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3 XXX We need more tests! Some tests are in test_bytes
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4 """
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5
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6 import unittest
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7 import test.support
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8 import sys
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9 import gc
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10 import weakref
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11 import array
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12 import io
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13
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14
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15 class AbstractMemoryTests:
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16 source_bytes = b"abcdef"
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17
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18 @property
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19 def _source(self):
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20 return self.source_bytes
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21
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22 @property
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23 def _types(self):
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24 return filter(None, [self.ro_type, self.rw_type])
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25
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26 def check_getitem_with_type(self, tp):
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27 item = self.getitem_type
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28 b = tp(self._source)
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29 oldrefcount = sys.getrefcount(b)
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30 m = self._view(b)
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31 self.assertEqual(m[0], item(b"a"))
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32 self.assertIsInstance(m[0], bytes)
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33 self.assertEqual(m[5], item(b"f"))
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34 self.assertEqual(m[-1], item(b"f"))
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35 self.assertEqual(m[-6], item(b"a"))
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36 # Bounds checking
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37 self.assertRaises(IndexError, lambda: m[6])
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38 self.assertRaises(IndexError, lambda: m[-7])
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39 self.assertRaises(IndexError, lambda: m[sys.maxsize])
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40 self.assertRaises(IndexError, lambda: m[-sys.maxsize])
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41 # Type checking
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42 self.assertRaises(TypeError, lambda: m[None])
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43 self.assertRaises(TypeError, lambda: m[0.0])
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44 self.assertRaises(TypeError, lambda: m["a"])
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45 m = None
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46 self.assertEqual(sys.getrefcount(b), oldrefcount)
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47
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48 def test_getitem(self):
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49 for tp in self._types:
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50 self.check_getitem_with_type(tp)
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51
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52 def test_iter(self):
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53 for tp in self._types:
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54 b = tp(self._source)
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55 m = self._view(b)
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56 self.assertEqual(list(m), [m[i] for i in range(len(m))])
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57
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58 def test_setitem_readonly(self):
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59 if not self.ro_type:
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60 return
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61 b = self.ro_type(self._source)
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62 oldrefcount = sys.getrefcount(b)
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63 m = self._view(b)
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64 def setitem(value):
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65 m[0] = value
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66 self.assertRaises(TypeError, setitem, b"a")
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67 self.assertRaises(TypeError, setitem, 65)
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68 self.assertRaises(TypeError, setitem, memoryview(b"a"))
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69 m = None
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70 self.assertEqual(sys.getrefcount(b), oldrefcount)
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71
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72 def test_setitem_writable(self):
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73 if not self.rw_type:
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74 return
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75 tp = self.rw_type
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76 b = self.rw_type(self._source)
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77 oldrefcount = sys.getrefcount(b)
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78 m = self._view(b)
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79 m[0] = tp(b"0")
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80 self._check_contents(tp, b, b"0bcdef")
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81 m[1:3] = tp(b"12")
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82 self._check_contents(tp, b, b"012def")
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83 m[1:1] = tp(b"")
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84 self._check_contents(tp, b, b"012def")
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85 m[:] = tp(b"abcdef")
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86 self._check_contents(tp, b, b"abcdef")
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87
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88 # Overlapping copies of a view into itself
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89 m[0:3] = m[2:5]
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90 self._check_contents(tp, b, b"cdedef")
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91 m[:] = tp(b"abcdef")
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92 m[2:5] = m[0:3]
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93 self._check_contents(tp, b, b"ababcf")
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94
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95 def setitem(key, value):
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96 m[key] = tp(value)
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97 # Bounds checking
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98 self.assertRaises(IndexError, setitem, 6, b"a")
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99 self.assertRaises(IndexError, setitem, -7, b"a")
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100 self.assertRaises(IndexError, setitem, sys.maxsize, b"a")
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101 self.assertRaises(IndexError, setitem, -sys.maxsize, b"a")
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102 # Wrong index/slice types
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103 self.assertRaises(TypeError, setitem, 0.0, b"a")
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104 self.assertRaises(TypeError, setitem, (0,), b"a")
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105 self.assertRaises(TypeError, setitem, "a", b"a")
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106 # Trying to resize the memory object
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107 self.assertRaises(ValueError, setitem, 0, b"")
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108 self.assertRaises(ValueError, setitem, 0, b"ab")
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109 self.assertRaises(ValueError, setitem, slice(1,1), b"a")
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110 self.assertRaises(ValueError, setitem, slice(0,2), b"a")
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111
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112 m = None
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113 self.assertEqual(sys.getrefcount(b), oldrefcount)
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114
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115 def test_delitem(self):
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116 for tp in self._types:
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117 b = tp(self._source)
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118 m = self._view(b)
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119 with self.assertRaises(TypeError):
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120 del m[1]
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121 with self.assertRaises(TypeError):
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122 del m[1:4]
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123
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124 def test_tobytes(self):
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125 for tp in self._types:
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126 m = self._view(tp(self._source))
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127 b = m.tobytes()
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128 # This calls self.getitem_type() on each separate byte of b"abcdef"
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129 expected = b"".join(
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130 self.getitem_type(bytes([c])) for c in b"abcdef")
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131 self.assertEqual(b, expected)
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132 self.assertIsInstance(b, bytes)
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133
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134 def test_tolist(self):
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135 for tp in self._types:
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136 m = self._view(tp(self._source))
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137 l = m.tolist()
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138 self.assertEqual(l, list(b"abcdef"))
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139
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140 def test_compare(self):
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141 # memoryviews can compare for equality with other objects
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142 # having the buffer interface.
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143 for tp in self._types:
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144 m = self._view(tp(self._source))
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145 for tp_comp in self._types:
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146 self.assertTrue(m == tp_comp(b"abcdef"))
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147 self.assertFalse(m != tp_comp(b"abcdef"))
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148 self.assertFalse(m == tp_comp(b"abcde"))
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149 self.assertTrue(m != tp_comp(b"abcde"))
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150 self.assertFalse(m == tp_comp(b"abcde1"))
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151 self.assertTrue(m != tp_comp(b"abcde1"))
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152 self.assertTrue(m == m)
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153 self.assertTrue(m == m[:])
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154 self.assertTrue(m[0:6] == m[:])
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155 self.assertFalse(m[0:5] == m)
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156
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157 # Comparison with objects which don't support the buffer API
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158 self.assertFalse(m == "abcdef")
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159 self.assertTrue(m != "abcdef")
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160 self.assertFalse("abcdef" == m)
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161 self.assertTrue("abcdef" != m)
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162
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163 # Unordered comparisons
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164 for c in (m, b"abcdef"):
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165 self.assertRaises(TypeError, lambda: m < c)
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166 self.assertRaises(TypeError, lambda: c <= m)
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167 self.assertRaises(TypeError, lambda: m >= c)
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168 self.assertRaises(TypeError, lambda: c > m)
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169
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170 def check_attributes_with_type(self, tp):
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171 m = self._view(tp(self._source))
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172 self.assertEqual(m.format, self.format)
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173 self.assertEqual(m.itemsize, self.itemsize)
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174 self.assertEqual(m.ndim, 1)
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175 self.assertEqual(m.shape, (6,))
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176 self.assertEqual(len(m), 6)
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177 self.assertEqual(m.strides, (self.itemsize,))
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178 self.assertEqual(m.suboffsets, None)
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179 return m
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180
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181 def test_attributes_readonly(self):
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182 if not self.ro_type:
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183 return
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184 m = self.check_attributes_with_type(self.ro_type)
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185 self.assertEqual(m.readonly, True)
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186
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187 def test_attributes_writable(self):
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188 if not self.rw_type:
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189 return
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190 m = self.check_attributes_with_type(self.rw_type)
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191 self.assertEqual(m.readonly, False)
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192
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193 def test_getbuffer(self):
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194 # Test PyObject_GetBuffer() on a memoryview object.
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195 for tp in self._types:
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196 b = tp(self._source)
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197 oldrefcount = sys.getrefcount(b)
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198 m = self._view(b)
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199 oldviewrefcount = sys.getrefcount(m)
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200 s = str(m, "utf-8")
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201 self._check_contents(tp, b, s.encode("utf-8"))
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202 self.assertEqual(sys.getrefcount(m), oldviewrefcount)
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203 m = None
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204 self.assertEqual(sys.getrefcount(b), oldrefcount)
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205
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206 def test_gc(self):
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207 for tp in self._types:
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208 if not isinstance(tp, type):
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209 # If tp is a factory rather than a plain type, skip
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210 continue
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211
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212 class MySource(tp):
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213 pass
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214 class MyObject:
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215 pass
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216
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217 # Create a reference cycle through a memoryview object
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218 b = MySource(tp(b'abc'))
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219 m = self._view(b)
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220 o = MyObject()
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221 b.m = m
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222 b.o = o
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223 wr = weakref.ref(o)
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224 b = m = o = None
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225 # The cycle must be broken
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226 gc.collect()
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227 self.assertTrue(wr() is None, wr())
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228
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229 def _check_released(self, m, tp):
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230 check = self.assertRaisesRegex(ValueError, "released")
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231 with check: bytes(m)
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232 with check: m.tobytes()
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233 with check: m.tolist()
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234 with check: m[0]
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235 with check: m[0] = b'x'
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236 with check: len(m)
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237 with check: m.format
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238 with check: m.itemsize
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239 with check: m.ndim
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240 with check: m.readonly
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241 with check: m.shape
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242 with check: m.strides
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243 with check:
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244 with m:
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245 pass
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246 # str() and repr() still function
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247 self.assertIn("released memory", str(m))
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248 self.assertIn("released memory", repr(m))
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249 self.assertEqual(m, m)
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250 self.assertNotEqual(m, memoryview(tp(self._source)))
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251 self.assertNotEqual(m, tp(self._source))
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252
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253 def test_contextmanager(self):
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254 for tp in self._types:
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255 b = tp(self._source)
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256 m = self._view(b)
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257 with m as cm:
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258 self.assertIs(cm, m)
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259 self._check_released(m, tp)
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260 m = self._view(b)
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261 # Can release explicitly inside the context manager
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262 with m:
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263 m.release()
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264
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265 def test_release(self):
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266 for tp in self._types:
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267 b = tp(self._source)
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268 m = self._view(b)
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269 m.release()
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270 self._check_released(m, tp)
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271 # Can be called a second time (it's a no-op)
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272 m.release()
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273 self._check_released(m, tp)
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274
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275 def test_writable_readonly(self):
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276 # Issue #10451: memoryview incorrectly exposes a readonly
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277 # buffer as writable causing a segfault if using mmap
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278 tp = self.ro_type
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279 if tp is None:
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280 return
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281 b = tp(self._source)
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282 m = self._view(b)
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283 i = io.BytesIO(b'ZZZZ')
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284 self.assertRaises(TypeError, i.readinto, m)
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285
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286 # Variations on source objects for the buffer: bytes-like objects, then arrays
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287 # with itemsize > 1.
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288 # NOTE: support for multi-dimensional objects is unimplemented.
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289
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290 class BaseBytesMemoryTests(AbstractMemoryTests):
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291 ro_type = bytes
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292 rw_type = bytearray
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293 getitem_type = bytes
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294 itemsize = 1
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295 format = 'B'
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296
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297 class BaseArrayMemoryTests(AbstractMemoryTests):
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298 ro_type = None
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299 rw_type = lambda self, b: array.array('i', list(b))
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300 getitem_type = lambda self, b: array.array('i', list(b)).tobytes()
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301 itemsize = array.array('i').itemsize
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302 format = 'i'
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303
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304 def test_getbuffer(self):
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305 # XXX Test should be adapted for non-byte buffers
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306 pass
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307
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308 def test_tolist(self):
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309 # XXX NotImplementedError: tolist() only supports byte views
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310 pass
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311
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312
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313 # Variations on indirection levels: memoryview, slice of memoryview,
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314 # slice of slice of memoryview.
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315 # This is important to test allocation subtleties.
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316
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317 class BaseMemoryviewTests:
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318 def _view(self, obj):
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319 return memoryview(obj)
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320
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321 def _check_contents(self, tp, obj, contents):
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322 self.assertEqual(obj, tp(contents))
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323
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324 class BaseMemorySliceTests:
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325 source_bytes = b"XabcdefY"
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326
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327 def _view(self, obj):
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328 m = memoryview(obj)
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329 return m[1:7]
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330
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331 def _check_contents(self, tp, obj, contents):
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332 self.assertEqual(obj[1:7], tp(contents))
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333
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334 def test_refs(self):
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335 for tp in self._types:
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336 m = memoryview(tp(self._source))
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337 oldrefcount = sys.getrefcount(m)
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338 m[1:2]
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339 self.assertEqual(sys.getrefcount(m), oldrefcount)
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340
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341 class BaseMemorySliceSliceTests:
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342 source_bytes = b"XabcdefY"
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343
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344 def _view(self, obj):
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345 m = memoryview(obj)
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346 return m[:7][1:]
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347
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348 def _check_contents(self, tp, obj, contents):
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349 self.assertEqual(obj[1:7], tp(contents))
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350
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351
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352 # Concrete test classes
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353
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354 class BytesMemoryviewTest(unittest.TestCase,
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355 BaseMemoryviewTests, BaseBytesMemoryTests):
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356
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357 def test_constructor(self):
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358 for tp in self._types:
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359 ob = tp(self._source)
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360 self.assertTrue(memoryview(ob))
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361 self.assertTrue(memoryview(object=ob))
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362 self.assertRaises(TypeError, memoryview)
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363 self.assertRaises(TypeError, memoryview, ob, ob)
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364 self.assertRaises(TypeError, memoryview, argument=ob)
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365 self.assertRaises(TypeError, memoryview, ob, argument=True)
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366
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367 class ArrayMemoryviewTest(unittest.TestCase,
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368 BaseMemoryviewTests, BaseArrayMemoryTests):
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369
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370 def test_array_assign(self):
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371 # Issue #4569: segfault when mutating a memoryview with itemsize != 1
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372 a = array.array('i', range(10))
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373 m = memoryview(a)
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374 new_a = array.array('i', range(9, -1, -1))
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375 m[:] = new_a
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376 self.assertEqual(a, new_a)
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377
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378
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379 class BytesMemorySliceTest(unittest.TestCase,
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380 BaseMemorySliceTests, BaseBytesMemoryTests):
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381 pass
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382
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383 class ArrayMemorySliceTest(unittest.TestCase,
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384 BaseMemorySliceTests, BaseArrayMemoryTests):
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385 pass
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386
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387 class BytesMemorySliceSliceTest(unittest.TestCase,
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388 BaseMemorySliceSliceTests, BaseBytesMemoryTests):
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parents: 50083
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389 pass
26045ed0c26e Merged revisions 68200 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 50083
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390
26045ed0c26e Merged revisions 68200 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 50083
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391 class ArrayMemorySliceSliceTest(unittest.TestCase,
26045ed0c26e Merged revisions 68200 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 50083
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392 BaseMemorySliceSliceTests, BaseArrayMemoryTests):
26045ed0c26e Merged revisions 68200 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 50083
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393 pass
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501256c54c84 Issue #2394: implement more of the memoryview API.
Antoine Pitrou <solipsis@pitrou.net>
parents: 47201
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394
501256c54c84 Issue #2394: implement more of the memoryview API.
Antoine Pitrou <solipsis@pitrou.net>
parents: 47201
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395
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2d8d6855a602 Fixed memoryview constructor. It allowed arbitrary keyword arguments. The bug was found by mykhal from #python. I've also added a small test case in the new test_memoryview.py
Christian Heimes <christian@cheimes.de>
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396 def test_main():
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26045ed0c26e Merged revisions 68200 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 50083
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397 test.support.run_unittest(__name__)
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2d8d6855a602 Fixed memoryview constructor. It allowed arbitrary keyword arguments. The bug was found by mykhal from #python. I've also added a small test case in the new test_memoryview.py
Christian Heimes <christian@cheimes.de>
parents:
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398
2d8d6855a602 Fixed memoryview constructor. It allowed arbitrary keyword arguments. The bug was found by mykhal from #python. I've also added a small test case in the new test_memoryview.py
Christian Heimes <christian@cheimes.de>
parents:
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399 if __name__ == "__main__":
2d8d6855a602 Fixed memoryview constructor. It allowed arbitrary keyword arguments. The bug was found by mykhal from #python. I've also added a small test case in the new test_memoryview.py
Christian Heimes <christian@cheimes.de>
parents:
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400 test_main()