Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_contextlib.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 68cfc51e4331
children 762d89faceaa 260c8ed3f5df
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1 """Unit tests for contextlib.py, and other context managers."""
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2
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3
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4 import sys
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5 import os
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6 import decimal
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7 import tempfile
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8 import unittest
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9 import threading
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10 from contextlib import * # Tests __all__
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11 from test import test_support
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12
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13 class ContextManagerTestCase(unittest.TestCase):
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14
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15 def test_contextmanager_plain(self):
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16 state = []
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17 @contextmanager
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18 def woohoo():
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19 state.append(1)
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20 yield 42
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21 state.append(999)
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22 with woohoo() as x:
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23 self.assertEqual(state, [1])
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24 self.assertEqual(x, 42)
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25 state.append(x)
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26 self.assertEqual(state, [1, 42, 999])
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27
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28 def test_contextmanager_finally(self):
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29 state = []
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30 @contextmanager
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31 def woohoo():
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32 state.append(1)
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33 try:
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34 yield 42
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35 finally:
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36 state.append(999)
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37 try:
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38 with woohoo() as x:
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39 self.assertEqual(state, [1])
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40 self.assertEqual(x, 42)
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41 state.append(x)
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42 raise ZeroDivisionError()
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43 except ZeroDivisionError:
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44 pass
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45 else:
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46 self.fail("Expected ZeroDivisionError")
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47 self.assertEqual(state, [1, 42, 999])
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48
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49 def test_contextmanager_no_reraise(self):
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50 @contextmanager
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51 def whee():
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52 yield
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53 ctx = whee()
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54 ctx.__enter__()
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55 # Calling __exit__ should not result in an exception
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56 self.failIf(ctx.__exit__(TypeError, TypeError("foo"), None))
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57
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58 def test_contextmanager_trap_yield_after_throw(self):
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59 @contextmanager
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60 def whoo():
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61 try:
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62 yield
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63 except:
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64 yield
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65 ctx = whoo()
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66 ctx.__enter__()
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67 self.assertRaises(
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68 RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), None
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69 )
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70
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71 def test_contextmanager_except(self):
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72 state = []
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73 @contextmanager
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74 def woohoo():
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75 state.append(1)
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76 try:
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77 yield 42
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78 except ZeroDivisionError, e:
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79 state.append(e.args[0])
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80 self.assertEqual(state, [1, 42, 999])
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81 with woohoo() as x:
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82 self.assertEqual(state, [1])
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83 self.assertEqual(x, 42)
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84 state.append(x)
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85 raise ZeroDivisionError(999)
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86 self.assertEqual(state, [1, 42, 999])
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87
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88 def test_contextmanager_attribs(self):
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89 def attribs(**kw):
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90 def decorate(func):
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91 for k,v in kw.items():
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92 setattr(func,k,v)
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93 return func
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94 return decorate
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95 @contextmanager
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96 @attribs(foo='bar')
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97 def baz(spam):
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98 """Whee!"""
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99 self.assertEqual(baz.__name__,'baz')
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100 self.assertEqual(baz.foo, 'bar')
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101 self.assertEqual(baz.__doc__, "Whee!")
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102
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103 class NestedTestCase(unittest.TestCase):
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104
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105 # XXX This needs more work
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106
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107 def test_nested(self):
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108 @contextmanager
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109 def a():
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110 yield 1
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111 @contextmanager
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112 def b():
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113 yield 2
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114 @contextmanager
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115 def c():
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116 yield 3
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117 with nested(a(), b(), c()) as (x, y, z):
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118 self.assertEqual(x, 1)
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119 self.assertEqual(y, 2)
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120 self.assertEqual(z, 3)
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121
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122 def test_nested_cleanup(self):
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123 state = []
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124 @contextmanager
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125 def a():
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126 state.append(1)
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127 try:
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128 yield 2
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129 finally:
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130 state.append(3)
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131 @contextmanager
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132 def b():
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133 state.append(4)
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134 try:
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135 yield 5
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136 finally:
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137 state.append(6)
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138 try:
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139 with nested(a(), b()) as (x, y):
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140 state.append(x)
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141 state.append(y)
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142 1/0
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143 except ZeroDivisionError:
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144 self.assertEqual(state, [1, 4, 2, 5, 6, 3])
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145 else:
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146 self.fail("Didn't raise ZeroDivisionError")
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147
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148 def test_nested_right_exception(self):
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149 state = []
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150 @contextmanager
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151 def a():
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152 yield 1
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153 class b(object):
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154 def __enter__(self):
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155 return 2
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156 def __exit__(self, *exc_info):
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157 try:
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158 raise Exception()
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159 except:
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160 pass
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161 try:
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162 with nested(a(), b()) as (x, y):
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163 1/0
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164 except ZeroDivisionError:
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165 self.assertEqual((x, y), (1, 2))
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166 except Exception:
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167 self.fail("Reraised wrong exception")
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168 else:
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169 self.fail("Didn't raise ZeroDivisionError")
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170
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171 def test_nested_b_swallows(self):
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172 @contextmanager
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173 def a():
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174 yield
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175 @contextmanager
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176 def b():
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177 try:
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178 yield
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179 except:
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180 # Swallow the exception
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181 pass
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182 try:
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183 with nested(a(), b()):
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184 1/0
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185 except ZeroDivisionError:
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186 self.fail("Didn't swallow ZeroDivisionError")
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187
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188 def test_nested_break(self):
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189 @contextmanager
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190 def a():
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191 yield
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192 state = 0
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193 while True:
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194 state += 1
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195 with nested(a(), a()):
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196 break
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197 state += 10
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198 self.assertEqual(state, 1)
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199
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200 def test_nested_continue(self):
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201 @contextmanager
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202 def a():
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203 yield
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204 state = 0
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205 while state < 3:
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206 state += 1
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207 with nested(a(), a()):
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208 continue
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209 state += 10
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210 self.assertEqual(state, 3)
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211
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212 def test_nested_return(self):
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213 @contextmanager
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214 def a():
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215 try:
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216 yield
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217 except:
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218 pass
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219 def foo():
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220 with nested(a(), a()):
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221 return 1
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222 return 10
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223 self.assertEqual(foo(), 1)
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224
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225 class ClosingTestCase(unittest.TestCase):
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226
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227 # XXX This needs more work
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228
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229 def test_closing(self):
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230 state = []
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231 class C:
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232 def close(self):
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233 state.append(1)
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234 x = C()
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235 self.assertEqual(state, [])
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236 with closing(x) as y:
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237 self.assertEqual(x, y)
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238 self.assertEqual(state, [1])
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239
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240 def test_closing_error(self):
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241 state = []
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242 class C:
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243 def close(self):
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244 state.append(1)
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245 x = C()
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246 self.assertEqual(state, [])
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247 try:
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248 with closing(x) as y:
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249 self.assertEqual(x, y)
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250 1/0
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251 except ZeroDivisionError:
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252 self.assertEqual(state, [1])
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253 else:
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254 self.fail("Didn't raise ZeroDivisionError")
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255
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256 class FileContextTestCase(unittest.TestCase):
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257
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258 def testWithOpen(self):
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259 tfn = tempfile.mktemp()
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260 try:
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261 f = None
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diff changeset
262 with open(tfn, "w") as f:
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263 self.failIf(f.closed)
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264 f.write("Booh\n")
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265 self.failUnless(f.closed)
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266 f = None
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267 try:
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diff changeset
268 with open(tfn, "r") as f:
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269 self.failIf(f.closed)
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270 self.assertEqual(f.read(), "Booh\n")
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271 1/0
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272 except ZeroDivisionError:
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273 self.failUnless(f.closed)
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274 else:
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275 self.fail("Didn't raise ZeroDivisionError")
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276 finally:
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277 try:
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278 os.remove(tfn)
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279 except os.error:
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280 pass
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281
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282 class LockContextTestCase(unittest.TestCase):
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283
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284 def boilerPlate(self, lock, locked):
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285 self.failIf(locked())
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286 with lock:
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287 self.failUnless(locked())
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288 self.failIf(locked())
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289 try:
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290 with lock:
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291 self.failUnless(locked())
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292 1/0
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293 except ZeroDivisionError:
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294 self.failIf(locked())
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295 else:
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296 self.fail("Didn't raise ZeroDivisionError")
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297
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298 def testWithLock(self):
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299 lock = threading.Lock()
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300 self.boilerPlate(lock, lock.locked)
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301
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302 def testWithRLock(self):
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303 lock = threading.RLock()
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304 self.boilerPlate(lock, lock._is_owned)
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305
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306 def testWithCondition(self):
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307 lock = threading.Condition()
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308 def locked():
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309 return lock._is_owned()
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310 self.boilerPlate(lock, locked)
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311
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312 def testWithSemaphore(self):
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313 lock = threading.Semaphore()
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314 def locked():
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315 if lock.acquire(False):
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316 lock.release()
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317 return False
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318 else:
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319 return True
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320 self.boilerPlate(lock, locked)
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321
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322 def testWithBoundedSemaphore(self):
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323 lock = threading.BoundedSemaphore()
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324 def locked():
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325 if lock.acquire(False):
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326 lock.release()
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327 return False
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328 else:
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329 return True
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330 self.boilerPlate(lock, locked)
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331
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332 # This is needed to make the test actually run under regrtest.py!
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333 def test_main():
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334 test_support.run_unittest(__name__)
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335
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336 if __name__ == "__main__":
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337 test_main()