Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_memoryview.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 75efd757434b
children f65adad3988d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
52749
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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 sys
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8 import gc
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9 import weakref
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10 import array
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11 from test import test_support
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12
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13
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14 class AbstractMemoryTests:
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15 source_bytes = b"abcdef"
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16
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17 @property
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18 def _source(self):
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19 return self.source_bytes
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20
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21 @property
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22 def _types(self):
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23 return filter(None, [self.ro_type, self.rw_type])
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24
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25 def check_getitem_with_type(self, tp):
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26 item = self.getitem_type
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27 b = tp(self._source)
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28 oldrefcount = sys.getrefcount(b)
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29 m = self._view(b)
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30 self.assertEquals(m[0], item(b"a"))
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31 self.assert_(isinstance(m[0], bytes), type(m[0]))
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32 self.assertEquals(m[5], item(b"f"))
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33 self.assertEquals(m[-1], item(b"f"))
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34 self.assertEquals(m[-6], item(b"a"))
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35 # Bounds checking
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36 self.assertRaises(IndexError, lambda: m[6])
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37 self.assertRaises(IndexError, lambda: m[-7])
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38 self.assertRaises(IndexError, lambda: m[sys.maxsize])
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39 self.assertRaises(IndexError, lambda: m[-sys.maxsize])
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40 # Type checking
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41 self.assertRaises(TypeError, lambda: m[None])
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42 self.assertRaises(TypeError, lambda: m[0.0])
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43 self.assertRaises(TypeError, lambda: m["a"])
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44 m = None
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45 self.assertEquals(sys.getrefcount(b), oldrefcount)
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46
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47 def test_getitem(self):
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48 for tp in self._types:
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49 self.check_getitem_with_type(tp)
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50
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51 def test_setitem_readonly(self):
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52 if not self.ro_type:
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53 return
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54 b = self.ro_type(self._source)
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55 oldrefcount = sys.getrefcount(b)
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56 m = self._view(b)
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57 def setitem(value):
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58 m[0] = value
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59 self.assertRaises(TypeError, setitem, b"a")
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60 self.assertRaises(TypeError, setitem, 65)
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61 self.assertRaises(TypeError, setitem, memoryview(b"a"))
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62 m = None
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63 self.assertEquals(sys.getrefcount(b), oldrefcount)
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64
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65 def test_setitem_writable(self):
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66 if not self.rw_type:
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67 return
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68 tp = self.rw_type
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69 b = self.rw_type(self._source)
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70 oldrefcount = sys.getrefcount(b)
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71 m = self._view(b)
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72 m[0] = tp(b"0")
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73 self._check_contents(tp, b, b"0bcdef")
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74 m[1:3] = tp(b"12")
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75 self._check_contents(tp, b, b"012def")
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76 m[1:1] = tp(b"")
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77 self._check_contents(tp, b, b"012def")
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78 m[:] = tp(b"abcdef")
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79 self._check_contents(tp, b, b"abcdef")
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80
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81 # Overlapping copies of a view into itself
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82 m[0:3] = m[2:5]
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83 self._check_contents(tp, b, b"cdedef")
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84 m[:] = tp(b"abcdef")
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85 m[2:5] = m[0:3]
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86 self._check_contents(tp, b, b"ababcf")
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87
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88 def setitem(key, value):
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89 m[key] = tp(value)
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90 # Bounds checking
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91 self.assertRaises(IndexError, setitem, 6, b"a")
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92 self.assertRaises(IndexError, setitem, -7, b"a")
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93 self.assertRaises(IndexError, setitem, sys.maxsize, b"a")
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94 self.assertRaises(IndexError, setitem, -sys.maxsize, b"a")
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95 # Wrong index/slice types
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96 self.assertRaises(TypeError, setitem, 0.0, b"a")
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97 self.assertRaises(TypeError, setitem, (0,), b"a")
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98 self.assertRaises(TypeError, setitem, "a", b"a")
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99 # Trying to resize the memory object
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100 self.assertRaises(ValueError, setitem, 0, b"")
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101 self.assertRaises(ValueError, setitem, 0, b"ab")
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102 self.assertRaises(ValueError, setitem, slice(1,1), b"a")
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103 self.assertRaises(ValueError, setitem, slice(0,2), b"a")
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104
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105 m = None
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106 self.assertEquals(sys.getrefcount(b), oldrefcount)
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107
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108 def test_tobytes(self):
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109 for tp in self._types:
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110 m = self._view(tp(self._source))
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111 b = m.tobytes()
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112 # This calls self.getitem_type() on each separate byte of b"abcdef"
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113 expected = b"".join(
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114 self.getitem_type(c) for c in b"abcdef")
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115 self.assertEquals(b, expected)
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116 self.assert_(isinstance(b, bytes), type(b))
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117
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118 def test_tolist(self):
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119 for tp in self._types:
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120 m = self._view(tp(self._source))
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121 l = m.tolist()
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122 self.assertEquals(l, map(ord, b"abcdef"))
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123
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124 def test_compare(self):
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125 # memoryviews can compare for equality with other objects
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126 # having the buffer interface.
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127 for tp in self._types:
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128 m = self._view(tp(self._source))
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129 for tp_comp in self._types:
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130 self.assertTrue(m == tp_comp(b"abcdef"))
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131 self.assertFalse(m != tp_comp(b"abcdef"))
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132 self.assertFalse(m == tp_comp(b"abcde"))
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133 self.assertTrue(m != tp_comp(b"abcde"))
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134 self.assertFalse(m == tp_comp(b"abcde1"))
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135 self.assertTrue(m != tp_comp(b"abcde1"))
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136 self.assertTrue(m == m)
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137 self.assertTrue(m == m[:])
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138 self.assertTrue(m[0:6] == m[:])
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139 self.assertFalse(m[0:5] == m)
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140
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141 # Comparison with objects which don't support the buffer API
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142 self.assertFalse(m == u"abcdef")
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143 self.assertTrue(m != u"abcdef")
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144 self.assertFalse(u"abcdef" == m)
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145 self.assertTrue(u"abcdef" != m)
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146
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147 # Unordered comparisons are unimplemented, and therefore give
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148 # arbitrary results (they raise a TypeError in py3k)
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149
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150 def check_attributes_with_type(self, tp):
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151 m = self._view(tp(self._source))
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152 self.assertEquals(m.format, self.format)
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153 self.assertEquals(m.itemsize, self.itemsize)
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154 self.assertEquals(m.ndim, 1)
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155 self.assertEquals(m.shape, (6,))
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156 self.assertEquals(len(m), 6)
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157 self.assertEquals(m.strides, (self.itemsize,))
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158 self.assertEquals(m.suboffsets, None)
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159 return m
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160
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161 def test_attributes_readonly(self):
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162 if not self.ro_type:
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163 return
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164 m = self.check_attributes_with_type(self.ro_type)
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165 self.assertEquals(m.readonly, True)
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166
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167 def test_attributes_writable(self):
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168 if not self.rw_type:
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169 return
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170 m = self.check_attributes_with_type(self.rw_type)
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171 self.assertEquals(m.readonly, False)
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172
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173 # Disabled: unicode uses the old buffer API in 2.x
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174
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175 #def test_getbuffer(self):
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176 ## Test PyObject_GetBuffer() on a memoryview object.
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177 #for tp in self._types:
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178 #b = tp(self._source)
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179 #oldrefcount = sys.getrefcount(b)
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180 #m = self._view(b)
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181 #oldviewrefcount = sys.getrefcount(m)
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182 #s = unicode(m, "utf-8")
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183 #self._check_contents(tp, b, s.encode("utf-8"))
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184 #self.assertEquals(sys.getrefcount(m), oldviewrefcount)
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185 #m = None
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186 #self.assertEquals(sys.getrefcount(b), oldrefcount)
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187
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188 def test_gc(self):
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189 for tp in self._types:
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190 if not isinstance(tp, type):
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191 # If tp is a factory rather than a plain type, skip
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192 continue
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193
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194 class MySource(tp):
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195 pass
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196 class MyObject:
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197 pass
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198
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199 # Create a reference cycle through a memoryview object
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200 b = MySource(tp(b'abc'))
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201 m = self._view(b)
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202 o = MyObject()
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203 b.m = m
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204 b.o = o
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205 wr = weakref.ref(o)
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206 b = m = o = None
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207 # The cycle must be broken
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208 gc.collect()
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209 self.assert_(wr() is None, wr())
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210
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211
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212 # Variations on source objects for the buffer: bytes-like objects, then arrays
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213 # with itemsize > 1.
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214 # NOTE: support for multi-dimensional objects is unimplemented.
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215
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216 class BaseBytesMemoryTests(AbstractMemoryTests):
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217 ro_type = bytes
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218 rw_type = bytearray
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219 getitem_type = bytes
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220 itemsize = 1
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221 format = 'B'
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222
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223 # Disabled: array.array() does not support the new buffer API in 2.x
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224
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225 #class BaseArrayMemoryTests(AbstractMemoryTests):
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226 #ro_type = None
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227 #rw_type = lambda self, b: array.array('i', map(ord, b))
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228 #getitem_type = lambda self, b: array.array('i', map(ord, b)).tostring()
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229 #itemsize = array.array('i').itemsize
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230 #format = 'i'
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231
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232 #def test_getbuffer(self):
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233 ## XXX Test should be adapted for non-byte buffers
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234 #pass
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235
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236 #def test_tolist(self):
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237 ## XXX NotImplementedError: tolist() only supports byte views
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238 #pass
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239
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240
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241 # Variations on indirection levels: memoryview, slice of memoryview,
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242 # slice of slice of memoryview.
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243 # This is important to test allocation subtleties.
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244
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245 class BaseMemoryviewTests:
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246 def _view(self, obj):
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247 return memoryview(obj)
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248
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249 def _check_contents(self, tp, obj, contents):
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250 self.assertEquals(obj, tp(contents))
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251
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252 class BaseMemorySliceTests:
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253 source_bytes = b"XabcdefY"
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254
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255 def _view(self, obj):
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256 m = memoryview(obj)
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257 return m[1:7]
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258
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259 def _check_contents(self, tp, obj, contents):
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260 self.assertEquals(obj[1:7], tp(contents))
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261
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262 def test_refs(self):
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263 for tp in self._types:
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264 m = memoryview(tp(self._source))
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265 oldrefcount = sys.getrefcount(m)
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266 m[1:2]
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267 self.assertEquals(sys.getrefcount(m), oldrefcount)
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268
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269 class BaseMemorySliceSliceTests:
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270 source_bytes = b"XabcdefY"
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271
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272 def _view(self, obj):
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273 m = memoryview(obj)
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274 return m[:7][1:]
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275
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276 def _check_contents(self, tp, obj, contents):
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277 self.assertEquals(obj[1:7], tp(contents))
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278
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279
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280 # Concrete test classes
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281
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282 class BytesMemoryviewTest(unittest.TestCase,
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283 BaseMemoryviewTests, BaseBytesMemoryTests):
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284
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285 def test_constructor(self):
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286 for tp in self._types:
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287 ob = tp(self._source)
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288 self.assert_(memoryview(ob))
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289 self.assert_(memoryview(object=ob))
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290 self.assertRaises(TypeError, memoryview)
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291 self.assertRaises(TypeError, memoryview, ob, ob)
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292 self.assertRaises(TypeError, memoryview, argument=ob)
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293 self.assertRaises(TypeError, memoryview, ob, argument=True)
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294
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295 #class ArrayMemoryviewTest(unittest.TestCase,
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296 #BaseMemoryviewTests, BaseArrayMemoryTests):
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297
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298 #def test_array_assign(self):
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299 ## Issue #4569: segfault when mutating a memoryview with itemsize != 1
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300 #a = array.array('i', range(10))
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301 #m = memoryview(a)
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302 #new_a = array.array('i', range(9, -1, -1))
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303 #m[:] = new_a
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304 #self.assertEquals(a, new_a)
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305
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306
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307 class BytesMemorySliceTest(unittest.TestCase,
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308 BaseMemorySliceTests, BaseBytesMemoryTests):
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309 pass
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310
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311 #class ArrayMemorySliceTest(unittest.TestCase,
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312 #BaseMemorySliceTests, BaseArrayMemoryTests):
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313 #pass
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314
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315 class BytesMemorySliceSliceTest(unittest.TestCase,
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316 BaseMemorySliceSliceTests, BaseBytesMemoryTests):
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317 pass
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318
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319 #class ArrayMemorySliceSliceTest(unittest.TestCase,
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320 #BaseMemorySliceSliceTests, BaseArrayMemoryTests):
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321 #pass
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322
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323
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324 def test_main():
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325 test_support.run_unittest(__name__)
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326
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327 if __name__ == "__main__":
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328 test_main()