Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_contextlib.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents b36cb4602e21
children
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rev   line source
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1 """Unit tests for contextlib.py, and other context managers."""
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2
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3 import sys
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4 import tempfile
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5 import unittest
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6 from contextlib import * # Tests __all__
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7 from test import test_support
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8 try:
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9 import threading
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10 except ImportError:
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11 threading = None
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12
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13
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14 class ContextManagerTestCase(unittest.TestCase):
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15
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16 def test_contextmanager_plain(self):
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17 state = []
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18 @contextmanager
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19 def woohoo():
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20 state.append(1)
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21 yield 42
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22 state.append(999)
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23 with woohoo() as x:
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24 self.assertEqual(state, [1])
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25 self.assertEqual(x, 42)
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26 state.append(x)
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27 self.assertEqual(state, [1, 42, 999])
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28
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29 def test_contextmanager_finally(self):
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30 state = []
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31 @contextmanager
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32 def woohoo():
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33 state.append(1)
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34 try:
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35 yield 42
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36 finally:
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37 state.append(999)
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38 with self.assertRaises(ZeroDivisionError):
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39 with woohoo() as x:
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40 self.assertEqual(state, [1])
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41 self.assertEqual(x, 42)
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42 state.append(x)
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43 raise ZeroDivisionError()
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44 self.assertEqual(state, [1, 42, 999])
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45
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46 def test_contextmanager_no_reraise(self):
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47 @contextmanager
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48 def whee():
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49 yield
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50 ctx = whee()
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51 ctx.__enter__()
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52 # Calling __exit__ should not result in an exception
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53 self.assertFalse(ctx.__exit__(TypeError, TypeError("foo"), None))
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54
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55 def test_contextmanager_trap_yield_after_throw(self):
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56 @contextmanager
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57 def whoo():
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58 try:
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59 yield
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60 except:
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61 yield
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62 ctx = whoo()
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63 ctx.__enter__()
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64 self.assertRaises(
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65 RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), None
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66 )
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67
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68 def test_contextmanager_except(self):
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69 state = []
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70 @contextmanager
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71 def woohoo():
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72 state.append(1)
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73 try:
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74 yield 42
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75 except ZeroDivisionError, e:
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76 state.append(e.args[0])
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77 self.assertEqual(state, [1, 42, 999])
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78 with woohoo() as x:
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79 self.assertEqual(state, [1])
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80 self.assertEqual(x, 42)
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81 state.append(x)
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82 raise ZeroDivisionError(999)
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83 self.assertEqual(state, [1, 42, 999])
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84
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85 def _create_contextmanager_attribs(self):
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86 def attribs(**kw):
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87 def decorate(func):
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88 for k,v in kw.items():
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89 setattr(func,k,v)
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90 return func
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91 return decorate
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92 @contextmanager
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93 @attribs(foo='bar')
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94 def baz(spam):
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95 """Whee!"""
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96 return baz
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97
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98 def test_contextmanager_attribs(self):
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99 baz = self._create_contextmanager_attribs()
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100 self.assertEqual(baz.__name__,'baz')
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101 self.assertEqual(baz.foo, 'bar')
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102
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103 @unittest.skipIf(sys.flags.optimize >= 2,
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104 "Docstrings are omitted with -O2 and above")
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105 def test_contextmanager_doc_attrib(self):
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106 baz = self._create_contextmanager_attribs()
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107 self.assertEqual(baz.__doc__, "Whee!")
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108
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109 class NestedTestCase(unittest.TestCase):
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110
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111 # XXX This needs more work
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112
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113 def test_nested(self):
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114 @contextmanager
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115 def a():
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116 yield 1
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117 @contextmanager
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118 def b():
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119 yield 2
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120 @contextmanager
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121 def c():
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122 yield 3
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123 with nested(a(), b(), c()) as (x, y, z):
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124 self.assertEqual(x, 1)
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125 self.assertEqual(y, 2)
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126 self.assertEqual(z, 3)
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127
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128 def test_nested_cleanup(self):
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129 state = []
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130 @contextmanager
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131 def a():
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132 state.append(1)
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133 try:
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134 yield 2
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135 finally:
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136 state.append(3)
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137 @contextmanager
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138 def b():
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139 state.append(4)
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140 try:
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141 yield 5
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142 finally:
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143 state.append(6)
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144 with self.assertRaises(ZeroDivisionError):
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145 with nested(a(), b()) as (x, y):
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146 state.append(x)
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147 state.append(y)
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148 1 // 0
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149 self.assertEqual(state, [1, 4, 2, 5, 6, 3])
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150
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151 def test_nested_right_exception(self):
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152 @contextmanager
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153 def a():
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154 yield 1
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155 class b(object):
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156 def __enter__(self):
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157 return 2
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158 def __exit__(self, *exc_info):
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159 try:
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160 raise Exception()
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161 except:
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162 pass
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163 with self.assertRaises(ZeroDivisionError):
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164 with nested(a(), b()) as (x, y):
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165 1 // 0
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166 self.assertEqual((x, y), (1, 2))
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167
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168 def test_nested_b_swallows(self):
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169 @contextmanager
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170 def a():
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171 yield
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172 @contextmanager
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173 def b():
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174 try:
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175 yield
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176 except:
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177 # Swallow the exception
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178 pass
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179 try:
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180 with nested(a(), b()):
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181 1 // 0
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182 except ZeroDivisionError:
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183 self.fail("Didn't swallow ZeroDivisionError")
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184
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185 def test_nested_break(self):
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186 @contextmanager
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187 def a():
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188 yield
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189 state = 0
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190 while True:
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191 state += 1
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192 with nested(a(), a()):
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193 break
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194 state += 10
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195 self.assertEqual(state, 1)
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196
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197 def test_nested_continue(self):
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198 @contextmanager
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199 def a():
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200 yield
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201 state = 0
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202 while state < 3:
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203 state += 1
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204 with nested(a(), a()):
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205 continue
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206 state += 10
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207 self.assertEqual(state, 3)
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208
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209 def test_nested_return(self):
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210 @contextmanager
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211 def a():
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212 try:
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213 yield
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214 except:
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215 pass
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216 def foo():
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217 with nested(a(), a()):
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218 return 1
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219 return 10
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220 self.assertEqual(foo(), 1)
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221
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222 class ClosingTestCase(unittest.TestCase):
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223
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224 # XXX This needs more work
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225
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226 def test_closing(self):
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227 state = []
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228 class C:
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229 def close(self):
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230 state.append(1)
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231 x = C()
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232 self.assertEqual(state, [])
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233 with closing(x) as y:
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234 self.assertEqual(x, y)
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235 self.assertEqual(state, [1])
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236
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237 def test_closing_error(self):
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238 state = []
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239 class C:
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240 def close(self):
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241 state.append(1)
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242 x = C()
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243 self.assertEqual(state, [])
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244 with self.assertRaises(ZeroDivisionError):
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245 with closing(x) as y:
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246 self.assertEqual(x, y)
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247 1 // 0
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248 self.assertEqual(state, [1])
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249
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250 class FileContextTestCase(unittest.TestCase):
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251
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252 def testWithOpen(self):
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253 tfn = tempfile.mktemp()
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254 try:
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255 f = None
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256 with open(tfn, "w") as f:
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257 self.assertFalse(f.closed)
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258 f.write("Booh\n")
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259 self.assertTrue(f.closed)
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260 f = None
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261 with self.assertRaises(ZeroDivisionError):
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262 with open(tfn, "r") as f:
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263 self.assertFalse(f.closed)
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264 self.assertEqual(f.read(), "Booh\n")
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265 1 // 0
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266 self.assertTrue(f.closed)
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267 finally:
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268 test_support.unlink(tfn)
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269
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270 @unittest.skipUnless(threading, 'Threading required for this test.')
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271 class LockContextTestCase(unittest.TestCase):
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272
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273 def boilerPlate(self, lock, locked):
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274 self.assertFalse(locked())
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275 with lock:
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276 self.assertTrue(locked())
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277 self.assertFalse(locked())
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278 with self.assertRaises(ZeroDivisionError):
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279 with lock:
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280 self.assertTrue(locked())
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281 1 // 0
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282 self.assertFalse(locked())
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283
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284 def testWithLock(self):
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285 lock = threading.Lock()
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286 self.boilerPlate(lock, lock.locked)
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287
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288 def testWithRLock(self):
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289 lock = threading.RLock()
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290 self.boilerPlate(lock, lock._is_owned)
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291
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292 def testWithCondition(self):
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293 lock = threading.Condition()
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294 def locked():
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295 return lock._is_owned()
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296 self.boilerPlate(lock, locked)
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297
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298 def testWithSemaphore(self):
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299 lock = threading.Semaphore()
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300 def locked():
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301 if lock.acquire(False):
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302 lock.release()
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303 return False
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304 else:
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305 return True
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306 self.boilerPlate(lock, locked)
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307
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308 def testWithBoundedSemaphore(self):
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309 lock = threading.BoundedSemaphore()
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310 def locked():
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311 if lock.acquire(False):
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312 lock.release()
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313 return False
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314 else:
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315 return True
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316 self.boilerPlate(lock, locked)
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317
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318 # This is needed to make the test actually run under regrtest.py!
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319 def test_main():
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320 with test_support.check_warnings(("With-statements now directly support "
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321 "multiple context managers",
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322 DeprecationWarning)):
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323 test_support.run_unittest(__name__)
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324
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325 if __name__ == "__main__":
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326 test_main()