Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_abc.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents b36cb4602e21
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Copyright 2007 Google, Inc. All Rights Reserved.
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2 # Licensed to PSF under a Contributor Agreement.
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3
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4 """Unit tests for abc.py."""
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5
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6 import unittest, weakref
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7 from test import test_support
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8
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9 import abc
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10 from inspect import isabstract
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11
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12
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13 class TestABC(unittest.TestCase):
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14
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15 def test_abstractmethod_basics(self):
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16 @abc.abstractmethod
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17 def foo(self): pass
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18 self.assertTrue(foo.__isabstractmethod__)
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19 def bar(self): pass
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20 self.assertFalse(hasattr(bar, "__isabstractmethod__"))
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21
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22 def test_abstractproperty_basics(self):
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23 @abc.abstractproperty
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24 def foo(self): pass
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25 self.assertTrue(foo.__isabstractmethod__)
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26 def bar(self): pass
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27 self.assertFalse(hasattr(bar, "__isabstractmethod__"))
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28
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29 class C:
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30 __metaclass__ = abc.ABCMeta
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31 @abc.abstractproperty
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32 def foo(self): return 3
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33 class D(C):
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34 @property
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35 def foo(self): return super(D, self).foo
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36 self.assertEqual(D().foo, 3)
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37
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38 def test_abstractmethod_integration(self):
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39 for abstractthing in [abc.abstractmethod, abc.abstractproperty]:
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40 class C:
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41 __metaclass__ = abc.ABCMeta
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42 @abstractthing
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43 def foo(self): pass # abstract
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44 def bar(self): pass # concrete
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45 self.assertEqual(C.__abstractmethods__, set(["foo"]))
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46 self.assertRaises(TypeError, C) # because foo is abstract
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47 self.assertTrue(isabstract(C))
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48 class D(C):
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49 def bar(self): pass # concrete override of concrete
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50 self.assertEqual(D.__abstractmethods__, set(["foo"]))
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51 self.assertRaises(TypeError, D) # because foo is still abstract
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52 self.assertTrue(isabstract(D))
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53 class E(D):
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54 def foo(self): pass
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55 self.assertEqual(E.__abstractmethods__, set())
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56 E() # now foo is concrete, too
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57 self.assertFalse(isabstract(E))
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58 class F(E):
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59 @abstractthing
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60 def bar(self): pass # abstract override of concrete
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61 self.assertEqual(F.__abstractmethods__, set(["bar"]))
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62 self.assertRaises(TypeError, F) # because bar is abstract now
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63 self.assertTrue(isabstract(F))
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64
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65 def test_subclass_oldstyle_class(self):
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66 class A:
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67 __metaclass__ = abc.ABCMeta
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68 class OldstyleClass:
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69 pass
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70 self.assertFalse(issubclass(OldstyleClass, A))
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71 self.assertFalse(issubclass(A, OldstyleClass))
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72
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73 def test_isinstance_class(self):
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74 class A:
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75 __metaclass__ = abc.ABCMeta
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76 class OldstyleClass:
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77 pass
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78 self.assertFalse(isinstance(OldstyleClass, A))
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79 self.assertTrue(isinstance(OldstyleClass, type(OldstyleClass)))
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80 self.assertFalse(isinstance(A, OldstyleClass))
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81 # This raises a recursion depth error, but is low-priority:
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82 # self.assertTrue(isinstance(A, abc.ABCMeta))
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83
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84 def test_registration_basics(self):
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85 class A:
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86 __metaclass__ = abc.ABCMeta
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87 class B(object):
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88 pass
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89 b = B()
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90 self.assertFalse(issubclass(B, A))
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91 self.assertFalse(issubclass(B, (A,)))
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92 self.assertNotIsInstance(b, A)
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93 self.assertNotIsInstance(b, (A,))
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94 A.register(B)
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95 self.assertTrue(issubclass(B, A))
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96 self.assertTrue(issubclass(B, (A,)))
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97 self.assertIsInstance(b, A)
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98 self.assertIsInstance(b, (A,))
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99 class C(B):
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100 pass
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101 c = C()
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102 self.assertTrue(issubclass(C, A))
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103 self.assertTrue(issubclass(C, (A,)))
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104 self.assertIsInstance(c, A)
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105 self.assertIsInstance(c, (A,))
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106
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107 def test_isinstance_invalidation(self):
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108 class A:
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109 __metaclass__ = abc.ABCMeta
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110 class B(object):
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111 pass
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112 b = B()
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113 self.assertFalse(isinstance(b, A))
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114 self.assertFalse(isinstance(b, (A,)))
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115 A.register(B)
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116 self.assertTrue(isinstance(b, A))
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117 self.assertTrue(isinstance(b, (A,)))
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118
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119 def test_registration_builtins(self):
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120 class A:
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121 __metaclass__ = abc.ABCMeta
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122 A.register(int)
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123 self.assertIsInstance(42, A)
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124 self.assertIsInstance(42, (A,))
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125 self.assertTrue(issubclass(int, A))
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126 self.assertTrue(issubclass(int, (A,)))
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127 class B(A):
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128 pass
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129 B.register(basestring)
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130 self.assertIsInstance("", A)
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131 self.assertIsInstance("", (A,))
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132 self.assertTrue(issubclass(str, A))
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133 self.assertTrue(issubclass(str, (A,)))
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134
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135 def test_registration_edge_cases(self):
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136 class A:
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137 __metaclass__ = abc.ABCMeta
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138 A.register(A) # should pass silently
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139 class A1(A):
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140 pass
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141 self.assertRaises(RuntimeError, A1.register, A) # cycles not allowed
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142 class B(object):
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143 pass
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144 A1.register(B) # ok
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145 A1.register(B) # should pass silently
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146 class C(A):
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147 pass
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148 A.register(C) # should pass silently
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149 self.assertRaises(RuntimeError, C.register, A) # cycles not allowed
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150 C.register(B) # ok
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151
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152 def test_register_non_class(self):
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153 class A(object):
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154 __metaclass__ = abc.ABCMeta
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155 self.assertRaisesRegexp(TypeError, "Can only register classes",
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156 A.register, 4)
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157
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158 def test_registration_transitiveness(self):
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159 class A:
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160 __metaclass__ = abc.ABCMeta
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161 self.assertTrue(issubclass(A, A))
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162 self.assertTrue(issubclass(A, (A,)))
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163 class B:
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164 __metaclass__ = abc.ABCMeta
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165 self.assertFalse(issubclass(A, B))
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166 self.assertFalse(issubclass(A, (B,)))
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167 self.assertFalse(issubclass(B, A))
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168 self.assertFalse(issubclass(B, (A,)))
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169 class C:
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170 __metaclass__ = abc.ABCMeta
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171 A.register(B)
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172 class B1(B):
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173 pass
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174 self.assertTrue(issubclass(B1, A))
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175 self.assertTrue(issubclass(B1, (A,)))
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176 class C1(C):
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177 pass
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178 B1.register(C1)
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179 self.assertFalse(issubclass(C, B))
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180 self.assertFalse(issubclass(C, (B,)))
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181 self.assertFalse(issubclass(C, B1))
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182 self.assertFalse(issubclass(C, (B1,)))
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183 self.assertTrue(issubclass(C1, A))
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184 self.assertTrue(issubclass(C1, (A,)))
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185 self.assertTrue(issubclass(C1, B))
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186 self.assertTrue(issubclass(C1, (B,)))
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187 self.assertTrue(issubclass(C1, B1))
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188 self.assertTrue(issubclass(C1, (B1,)))
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189 C1.register(int)
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190 class MyInt(int):
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191 pass
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192 self.assertTrue(issubclass(MyInt, A))
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193 self.assertTrue(issubclass(MyInt, (A,)))
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194 self.assertIsInstance(42, A)
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195 self.assertIsInstance(42, (A,))
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196
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197 def test_all_new_methods_are_called(self):
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198 class A:
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199 __metaclass__ = abc.ABCMeta
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200 class B(object):
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201 counter = 0
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202 def __new__(cls):
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203 B.counter += 1
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204 return super(B, cls).__new__(cls)
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205 class C(A, B):
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206 pass
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207 self.assertEqual(B.counter, 0)
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208 C()
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209 self.assertEqual(B.counter, 1)
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210
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211 def test_cache_leak(self):
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212 # See issue #2521.
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213 class A(object):
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214 __metaclass__ = abc.ABCMeta
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215 @abc.abstractmethod
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216 def f(self):
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217 pass
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218 class C(A):
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219 def f(self):
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220 A.f(self)
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221 r = weakref.ref(C)
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222 # Trigger cache.
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223 C().f()
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224 del C
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225 test_support.gc_collect()
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226 self.assertEqual(r(), None)
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227
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228 def test_main():
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229 test_support.run_unittest(TestABC)
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230
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231
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232 if __name__ == "__main__":
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233 unittest.main()