Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_dynamicclassattribute.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 3752c94368dd
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
86325
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1 # Test case for DynamicClassAttribute
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2 # more tests are in test_descr
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3
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4 import abc
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5 import sys
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6 import unittest
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7 from test.support import run_unittest
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8 from types import DynamicClassAttribute
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9
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10 class PropertyBase(Exception):
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11 pass
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12
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13 class PropertyGet(PropertyBase):
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14 pass
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15
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16 class PropertySet(PropertyBase):
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17 pass
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18
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19 class PropertyDel(PropertyBase):
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20 pass
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21
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22 class BaseClass(object):
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23 def __init__(self):
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24 self._spam = 5
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25
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26 @DynamicClassAttribute
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27 def spam(self):
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28 """BaseClass.getter"""
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29 return self._spam
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30
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31 @spam.setter
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32 def spam(self, value):
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33 self._spam = value
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34
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35 @spam.deleter
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36 def spam(self):
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37 del self._spam
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38
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39 class SubClass(BaseClass):
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40
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41 spam = BaseClass.__dict__['spam']
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42
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43 @spam.getter
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44 def spam(self):
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45 """SubClass.getter"""
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46 raise PropertyGet(self._spam)
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47
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48 @spam.setter
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49 def spam(self, value):
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50 raise PropertySet(self._spam)
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51
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52 @spam.deleter
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53 def spam(self):
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54 raise PropertyDel(self._spam)
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55
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56 class PropertyDocBase(object):
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57 _spam = 1
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58 def _get_spam(self):
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59 return self._spam
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60 spam = DynamicClassAttribute(_get_spam, doc="spam spam spam")
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61
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62 class PropertyDocSub(PropertyDocBase):
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63 spam = PropertyDocBase.__dict__['spam']
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64 @spam.getter
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65 def spam(self):
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66 """The decorator does not use this doc string"""
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67 return self._spam
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68
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69 class PropertySubNewGetter(BaseClass):
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70 spam = BaseClass.__dict__['spam']
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71 @spam.getter
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72 def spam(self):
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73 """new docstring"""
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74 return 5
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75
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76 class PropertyNewGetter(object):
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77 @DynamicClassAttribute
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78 def spam(self):
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79 """original docstring"""
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80 return 1
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81 @spam.getter
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82 def spam(self):
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83 """new docstring"""
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84 return 8
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85
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86 class ClassWithAbstractVirtualProperty(metaclass=abc.ABCMeta):
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87 @DynamicClassAttribute
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88 @abc.abstractmethod
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89 def color():
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90 pass
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91
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92 class ClassWithPropertyAbstractVirtual(metaclass=abc.ABCMeta):
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93 @abc.abstractmethod
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94 @DynamicClassAttribute
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95 def color():
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96 pass
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97
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98 class PropertyTests(unittest.TestCase):
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99 def test_property_decorator_baseclass(self):
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100 # see #1620
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101 base = BaseClass()
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102 self.assertEqual(base.spam, 5)
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103 self.assertEqual(base._spam, 5)
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104 base.spam = 10
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105 self.assertEqual(base.spam, 10)
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106 self.assertEqual(base._spam, 10)
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107 delattr(base, "spam")
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108 self.assertTrue(not hasattr(base, "spam"))
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109 self.assertTrue(not hasattr(base, "_spam"))
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110 base.spam = 20
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111 self.assertEqual(base.spam, 20)
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112 self.assertEqual(base._spam, 20)
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113
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114 def test_property_decorator_subclass(self):
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115 # see #1620
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116 sub = SubClass()
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117 self.assertRaises(PropertyGet, getattr, sub, "spam")
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118 self.assertRaises(PropertySet, setattr, sub, "spam", None)
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119 self.assertRaises(PropertyDel, delattr, sub, "spam")
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120
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121 @unittest.skipIf(sys.flags.optimize >= 2,
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122 "Docstrings are omitted with -O2 and above")
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123 def test_property_decorator_subclass_doc(self):
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124 sub = SubClass()
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125 self.assertEqual(sub.__class__.__dict__['spam'].__doc__, "SubClass.getter")
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126
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127 @unittest.skipIf(sys.flags.optimize >= 2,
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128 "Docstrings are omitted with -O2 and above")
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129 def test_property_decorator_baseclass_doc(self):
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130 base = BaseClass()
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131 self.assertEqual(base.__class__.__dict__['spam'].__doc__, "BaseClass.getter")
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132
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133 def test_property_decorator_doc(self):
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134 base = PropertyDocBase()
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135 sub = PropertyDocSub()
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136 self.assertEqual(base.__class__.__dict__['spam'].__doc__, "spam spam spam")
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137 self.assertEqual(sub.__class__.__dict__['spam'].__doc__, "spam spam spam")
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138
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139 @unittest.skipIf(sys.flags.optimize >= 2,
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140 "Docstrings are omitted with -O2 and above")
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141 def test_property_getter_doc_override(self):
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142 newgettersub = PropertySubNewGetter()
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143 self.assertEqual(newgettersub.spam, 5)
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144 self.assertEqual(newgettersub.__class__.__dict__['spam'].__doc__, "new docstring")
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145 newgetter = PropertyNewGetter()
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146 self.assertEqual(newgetter.spam, 8)
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147 self.assertEqual(newgetter.__class__.__dict__['spam'].__doc__, "new docstring")
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148
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149 def test_property___isabstractmethod__descriptor(self):
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150 for val in (True, False, [], [1], '', '1'):
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151 class C(object):
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152 def foo(self):
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153 pass
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154 foo.__isabstractmethod__ = val
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155 foo = DynamicClassAttribute(foo)
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156 self.assertIs(C.__dict__['foo'].__isabstractmethod__, bool(val))
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157
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158 # check that the DynamicClassAttribute's __isabstractmethod__ descriptor does the
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159 # right thing when presented with a value that fails truth testing:
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160 class NotBool(object):
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161 def __nonzero__(self):
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162 raise ValueError()
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163 __len__ = __nonzero__
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164 with self.assertRaises(ValueError):
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165 class C(object):
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166 def foo(self):
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167 pass
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168 foo.__isabstractmethod__ = NotBool()
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169 foo = DynamicClassAttribute(foo)
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170
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171 def test_abstract_virtual(self):
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172 self.assertRaises(TypeError, ClassWithAbstractVirtualProperty)
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173 self.assertRaises(TypeError, ClassWithPropertyAbstractVirtual)
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174 class APV(ClassWithPropertyAbstractVirtual):
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175 pass
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176 self.assertRaises(TypeError, APV)
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177 class AVP(ClassWithAbstractVirtualProperty):
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178 pass
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179 self.assertRaises(TypeError, AVP)
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180 class Okay1(ClassWithAbstractVirtualProperty):
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181 @DynamicClassAttribute
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182 def color(self):
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183 return self._color
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184 def __init__(self):
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185 self._color = 'cyan'
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186 with self.assertRaises(AttributeError):
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187 Okay1.color
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188 self.assertEqual(Okay1().color, 'cyan')
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189 class Okay2(ClassWithAbstractVirtualProperty):
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190 @DynamicClassAttribute
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191 def color(self):
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192 return self._color
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193 def __init__(self):
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194 self._color = 'magenta'
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195 with self.assertRaises(AttributeError):
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196 Okay2.color
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197 self.assertEqual(Okay2().color, 'magenta')
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198
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199
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200 # Issue 5890: subclasses of DynamicClassAttribute do not preserve method __doc__ strings
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201 class PropertySub(DynamicClassAttribute):
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202 """This is a subclass of DynamicClassAttribute"""
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203
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204 class PropertySubSlots(DynamicClassAttribute):
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205 """This is a subclass of DynamicClassAttribute that defines __slots__"""
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206 __slots__ = ()
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207
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208 class PropertySubclassTests(unittest.TestCase):
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209
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210 @unittest.skipIf(hasattr(PropertySubSlots, '__doc__'),
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211 "__doc__ is already present, __slots__ will have no effect")
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212 def test_slots_docstring_copy_exception(self):
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213 try:
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214 class Foo(object):
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215 @PropertySubSlots
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216 def spam(self):
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217 """Trying to copy this docstring will raise an exception"""
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218 return 1
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219 print('\n',spam.__doc__)
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220 except AttributeError:
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221 pass
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222 else:
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223 raise Exception("AttributeError not raised")
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224
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225 @unittest.skipIf(sys.flags.optimize >= 2,
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226 "Docstrings are omitted with -O2 and above")
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227 def test_docstring_copy(self):
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228 class Foo(object):
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229 @PropertySub
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230 def spam(self):
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231 """spam wrapped in DynamicClassAttribute subclass"""
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232 return 1
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233 self.assertEqual(
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234 Foo.__dict__['spam'].__doc__,
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235 "spam wrapped in DynamicClassAttribute subclass")
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236
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237 @unittest.skipIf(sys.flags.optimize >= 2,
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238 "Docstrings are omitted with -O2 and above")
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239 def test_property_setter_copies_getter_docstring(self):
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240 class Foo(object):
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241 def __init__(self): self._spam = 1
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242 @PropertySub
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243 def spam(self):
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244 """spam wrapped in DynamicClassAttribute subclass"""
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245 return self._spam
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246 @spam.setter
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247 def spam(self, value):
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248 """this docstring is ignored"""
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249 self._spam = value
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250 foo = Foo()
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251 self.assertEqual(foo.spam, 1)
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252 foo.spam = 2
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253 self.assertEqual(foo.spam, 2)
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254 self.assertEqual(
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255 Foo.__dict__['spam'].__doc__,
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256 "spam wrapped in DynamicClassAttribute subclass")
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257 class FooSub(Foo):
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258 spam = Foo.__dict__['spam']
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259 @spam.setter
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260 def spam(self, value):
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261 """another ignored docstring"""
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262 self._spam = 'eggs'
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263 foosub = FooSub()
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264 self.assertEqual(foosub.spam, 1)
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265 foosub.spam = 7
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266 self.assertEqual(foosub.spam, 'eggs')
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267 self.assertEqual(
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268 FooSub.__dict__['spam'].__doc__,
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269 "spam wrapped in DynamicClassAttribute subclass")
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270
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271 @unittest.skipIf(sys.flags.optimize >= 2,
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272 "Docstrings are omitted with -O2 and above")
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273 def test_property_new_getter_new_docstring(self):
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274
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275 class Foo(object):
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276 @PropertySub
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277 def spam(self):
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278 """a docstring"""
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279 return 1
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280 @spam.getter
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281 def spam(self):
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282 """a new docstring"""
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283 return 2
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284 self.assertEqual(Foo.__dict__['spam'].__doc__, "a new docstring")
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285 class FooBase(object):
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286 @PropertySub
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287 def spam(self):
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288 """a docstring"""
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289 return 1
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290 class Foo2(FooBase):
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291 spam = FooBase.__dict__['spam']
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292 @spam.getter
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293 def spam(self):
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294 """a new docstring"""
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295 return 2
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296 self.assertEqual(Foo.__dict__['spam'].__doc__, "a new docstring")
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297
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298
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299
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300 def test_main():
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301 run_unittest(PropertyTests, PropertySubclassTests)
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302
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303 if __name__ == '__main__':
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304 test_main()