Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_property.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 bba7ee9daee0
children 6768b2350c57
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1 # Test case for property
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2 # more tests are in test_descr
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3
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4 import unittest
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5 from test.test_support import run_unittest
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6
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7 class PropertyBase(Exception):
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8 pass
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9
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10 class PropertyGet(PropertyBase):
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11 pass
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12
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13 class PropertySet(PropertyBase):
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14 pass
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15
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16 class PropertyDel(PropertyBase):
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17 pass
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18
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19 class BaseClass(object):
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20 def __init__(self):
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21 self._spam = 5
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22
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23 @property
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24 def spam(self):
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25 """BaseClass.getter"""
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26 return self._spam
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27
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28 @spam.setter
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29 def spam(self, value):
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30 self._spam = value
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31
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32 @spam.deleter
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33 def spam(self):
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34 del self._spam
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35
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36 class SubClass(BaseClass):
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37
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38 @BaseClass.spam.getter
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39 def spam(self):
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40 """SubClass.getter"""
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41 raise PropertyGet(self._spam)
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42
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43 @spam.setter
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44 def spam(self, value):
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45 raise PropertySet(self._spam)
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46
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47 @spam.deleter
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48 def spam(self):
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49 raise PropertyDel(self._spam)
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50
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51 class PropertyDocBase(object):
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52 _spam = 1
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53 def _get_spam(self):
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54 return self._spam
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55 spam = property(_get_spam, doc="spam spam spam")
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56
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57 class PropertyDocSub(PropertyDocBase):
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58 @PropertyDocBase.spam.getter
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59 def spam(self):
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60 """The decorator does not use this doc string"""
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61 return self._spam
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62
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63 class PropertySubNewGetter(BaseClass):
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64 @BaseClass.spam.getter
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65 def spam(self):
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66 """new docstring"""
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67 return 5
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68
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69 class PropertyNewGetter(object):
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70 @property
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71 def spam(self):
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72 """original docstring"""
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73 return 1
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74 @spam.getter
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75 def spam(self):
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76 """new docstring"""
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77 return 8
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78
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79 class PropertyTests(unittest.TestCase):
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80 def test_property_decorator_baseclass(self):
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81 # see #1620
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82 base = BaseClass()
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83 self.assertEqual(base.spam, 5)
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84 self.assertEqual(base._spam, 5)
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85 base.spam = 10
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86 self.assertEqual(base.spam, 10)
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87 self.assertEqual(base._spam, 10)
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88 delattr(base, "spam")
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89 self.assert_(not hasattr(base, "spam"))
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90 self.assert_(not hasattr(base, "_spam"))
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91 base.spam = 20
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92 self.assertEqual(base.spam, 20)
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93 self.assertEqual(base._spam, 20)
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94 self.assertEqual(base.__class__.spam.__doc__, "BaseClass.getter")
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95
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96 def test_property_decorator_subclass(self):
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97 # see #1620
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98 sub = SubClass()
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99 self.assertRaises(PropertyGet, getattr, sub, "spam")
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100 self.assertRaises(PropertySet, setattr, sub, "spam", None)
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101 self.assertRaises(PropertyDel, delattr, sub, "spam")
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102 self.assertEqual(sub.__class__.spam.__doc__, "SubClass.getter")
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103
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104 def test_property_decorator_doc(self):
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105 base = PropertyDocBase()
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106 sub = PropertyDocSub()
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107 self.assertEqual(base.__class__.spam.__doc__, "spam spam spam")
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108 self.assertEqual(sub.__class__.spam.__doc__, "spam spam spam")
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109
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110 def test_property_getter_doc_override(self):
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111 newgettersub = PropertySubNewGetter()
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112 self.assertEqual(newgettersub.spam, 5)
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113 self.assertEqual(newgettersub.__class__.spam.__doc__, "new docstring")
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114 newgetter = PropertyNewGetter()
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115 self.assertEqual(newgetter.spam, 8)
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116 self.assertEqual(newgetter.__class__.spam.__doc__, "new docstring")
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117
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118
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119 # Issue 5890: subclasses of property do not preserve method __doc__ strings
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120 class PropertySub(property):
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121 """This is a subclass of property"""
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122
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123 class PropertySubSlots(property):
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124 """This is a subclass of property that defines __slots__"""
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125 __slots__ = ()
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126
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127 class PropertySubclassTests(unittest.TestCase):
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128
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129 def test_docstring_copy(self):
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130 class Foo(object):
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131 @PropertySub
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132 def spam(self):
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133 """spam wrapped in property subclass"""
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134 return 1
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135 self.assertEqual(
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136 Foo.spam.__doc__,
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137 "spam wrapped in property subclass")
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138
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139 def test_slots_docstring_copy_exception(self):
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140 try:
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141 class Foo(object):
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142 @PropertySubSlots
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143 def spam(self):
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144 """Trying to copy this docstring will raise an exception"""
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145 return 1
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146 except AttributeError:
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147 pass
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148 else:
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149 raise Exception("AttributeError not raised")
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150
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151 def test_property_setter_copies_getter_docstring(self):
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152 class Foo(object):
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153 def __init__(self): self._spam = 1
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154 @PropertySub
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155 def spam(self):
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156 """spam wrapped in property subclass"""
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157 return self._spam
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158 @spam.setter
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159 def spam(self, value):
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160 """this docstring is ignored"""
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161 self._spam = value
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162 foo = Foo()
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163 self.assertEqual(foo.spam, 1)
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164 foo.spam = 2
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165 self.assertEqual(foo.spam, 2)
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166 self.assertEqual(
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167 Foo.spam.__doc__,
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168 "spam wrapped in property subclass")
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169 class FooSub(Foo):
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170 @Foo.spam.setter
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171 def spam(self, value):
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172 """another ignored docstring"""
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173 self._spam = 'eggs'
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174 foosub = FooSub()
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175 self.assertEqual(foosub.spam, 1)
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176 foosub.spam = 7
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177 self.assertEqual(foosub.spam, 'eggs')
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178 self.assertEqual(
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179 FooSub.spam.__doc__,
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180 "spam wrapped in property subclass")
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181
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182 def test_property_new_getter_new_docstring(self):
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183
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184 class Foo(object):
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185 @PropertySub
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186 def spam(self):
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187 """a docstring"""
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188 return 1
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189 @spam.getter
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190 def spam(self):
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191 """a new docstring"""
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192 return 2
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193 self.assertEqual(Foo.spam.__doc__, "a new docstring")
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194 class FooBase(object):
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195 @PropertySub
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196 def spam(self):
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197 """a docstring"""
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198 return 1
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199 class Foo2(FooBase):
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200 @FooBase.spam.getter
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201 def spam(self):
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202 """a new docstring"""
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203 return 2
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204 self.assertEqual(Foo.spam.__doc__, "a new docstring")
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205
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206
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207
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208 def test_main():
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209 run_unittest(PropertyTests, PropertySubclassTests)
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210
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211 if __name__ == '__main__':
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212 test_main()