Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_contextlib.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents 6768b2350c57
children 70e115c34f97
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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 import warnings
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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 try:
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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 except ZeroDivisionError:
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45 pass
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46 else:
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47 self.fail("Expected ZeroDivisionError")
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48 self.assertEqual(state, [1, 42, 999])
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49
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50 def test_contextmanager_no_reraise(self):
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51 @contextmanager
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52 def whee():
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53 yield
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54 ctx = whee()
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55 ctx.__enter__()
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56 # Calling __exit__ should not result in an exception
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57 self.assertFalse(ctx.__exit__(TypeError, TypeError("foo"), None))
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58
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59 def test_contextmanager_trap_yield_after_throw(self):
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60 @contextmanager
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61 def whoo():
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62 try:
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63 yield
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64 except:
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65 yield
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66 ctx = whoo()
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67 ctx.__enter__()
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68 self.assertRaises(
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69 RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), None
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70 )
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71
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72 def test_contextmanager_except(self):
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73 state = []
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74 @contextmanager
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75 def woohoo():
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76 state.append(1)
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77 try:
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78 yield 42
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79 except ZeroDivisionError, e:
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80 state.append(e.args[0])
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81 self.assertEqual(state, [1, 42, 999])
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82 with woohoo() as x:
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83 self.assertEqual(state, [1])
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84 self.assertEqual(x, 42)
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85 state.append(x)
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86 raise ZeroDivisionError(999)
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87 self.assertEqual(state, [1, 42, 999])
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88
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89 def test_contextmanager_attribs(self):
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90 def attribs(**kw):
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91 def decorate(func):
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92 for k,v in kw.items():
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93 setattr(func,k,v)
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94 return func
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95 return decorate
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96 @contextmanager
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97 @attribs(foo='bar')
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98 def baz(spam):
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99 """Whee!"""
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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 self.assertEqual(baz.__doc__, "Whee!")
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103
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104 class NestedTestCase(unittest.TestCase):
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105
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106 # XXX This needs more work
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107
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108 def test_nested(self):
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109 @contextmanager
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110 def a():
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111 yield 1
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112 @contextmanager
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113 def b():
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114 yield 2
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115 @contextmanager
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116 def c():
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117 yield 3
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118 with nested(a(), b(), c()) as (x, y, z):
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119 self.assertEqual(x, 1)
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120 self.assertEqual(y, 2)
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121 self.assertEqual(z, 3)
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122
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123 def test_nested_cleanup(self):
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124 state = []
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125 @contextmanager
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126 def a():
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127 state.append(1)
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128 try:
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129 yield 2
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130 finally:
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131 state.append(3)
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132 @contextmanager
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133 def b():
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134 state.append(4)
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135 try:
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136 yield 5
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137 finally:
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138 state.append(6)
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139 try:
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140 with nested(a(), b()) as (x, y):
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141 state.append(x)
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142 state.append(y)
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143 1/0
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144 except ZeroDivisionError:
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145 self.assertEqual(state, [1, 4, 2, 5, 6, 3])
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146 else:
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147 self.fail("Didn't raise ZeroDivisionError")
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148
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149 def test_nested_right_exception(self):
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150 state = []
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151 @contextmanager
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152 def a():
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153 yield 1
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154 class b(object):
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155 def __enter__(self):
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156 return 2
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157 def __exit__(self, *exc_info):
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158 try:
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159 raise Exception()
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160 except:
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161 pass
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162 try:
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163 with nested(a(), b()) as (x, y):
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164 1/0
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165 except ZeroDivisionError:
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166 self.assertEqual((x, y), (1, 2))
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167 except Exception:
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168 self.fail("Reraised wrong exception")
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169 else:
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170 self.fail("Didn't raise ZeroDivisionError")
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171
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172 def test_nested_b_swallows(self):
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173 @contextmanager
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174 def a():
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175 yield
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176 @contextmanager
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177 def b():
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178 try:
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179 yield
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180 except:
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181 # Swallow the exception
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182 pass
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183 try:
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184 with nested(a(), b()):
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185 1/0
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186 except ZeroDivisionError:
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187 self.fail("Didn't swallow ZeroDivisionError")
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188
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189 def test_nested_break(self):
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190 @contextmanager
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191 def a():
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192 yield
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193 state = 0
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194 while True:
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195 state += 1
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196 with nested(a(), a()):
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197 break
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198 state += 10
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199 self.assertEqual(state, 1)
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200
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201 def test_nested_continue(self):
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202 @contextmanager
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203 def a():
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204 yield
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205 state = 0
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206 while state < 3:
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207 state += 1
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208 with nested(a(), a()):
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209 continue
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210 state += 10
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211 self.assertEqual(state, 3)
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212
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213 def test_nested_return(self):
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214 @contextmanager
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215 def a():
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216 try:
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217 yield
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218 except:
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219 pass
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220 def foo():
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221 with nested(a(), a()):
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222 return 1
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223 return 10
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224 self.assertEqual(foo(), 1)
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225
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226 class ClosingTestCase(unittest.TestCase):
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227
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228 # XXX This needs more work
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229
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230 def test_closing(self):
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231 state = []
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232 class C:
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233 def close(self):
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234 state.append(1)
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235 x = C()
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236 self.assertEqual(state, [])
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237 with closing(x) as y:
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238 self.assertEqual(x, y)
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239 self.assertEqual(state, [1])
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240
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241 def test_closing_error(self):
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242 state = []
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243 class C:
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244 def close(self):
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245 state.append(1)
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246 x = C()
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247 self.assertEqual(state, [])
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248 try:
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249 with closing(x) as y:
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250 self.assertEqual(x, y)
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251 1/0
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252 except ZeroDivisionError:
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253 self.assertEqual(state, [1])
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254 else:
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255 self.fail("Didn't raise ZeroDivisionError")
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256
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257 class FileContextTestCase(unittest.TestCase):
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258
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259 def testWithOpen(self):
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260 tfn = tempfile.mktemp()
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261 try:
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262 f = None
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263 with open(tfn, "w") as f:
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264 self.assertFalse(f.closed)
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265 f.write("Booh\n")
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266 self.assertTrue(f.closed)
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267 f = None
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268 try:
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269 with open(tfn, "r") as f:
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270 self.assertFalse(f.closed)
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271 self.assertEqual(f.read(), "Booh\n")
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272 1/0
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273 except ZeroDivisionError:
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274 self.assertTrue(f.closed)
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275 else:
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276 self.fail("Didn't raise ZeroDivisionError")
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277 finally:
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278 try:
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279 os.remove(tfn)
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280 except os.error:
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281 pass
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282
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283 class LockContextTestCase(unittest.TestCase):
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284
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285 def boilerPlate(self, lock, locked):
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286 self.assertFalse(locked())
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287 with lock:
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288 self.assertTrue(locked())
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289 self.assertFalse(locked())
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290 try:
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291 with lock:
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292 self.assertTrue(locked())
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293 1/0
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294 except ZeroDivisionError:
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295 self.assertFalse(locked())
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296 else:
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297 self.fail("Didn't raise ZeroDivisionError")
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298
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299 def testWithLock(self):
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300 lock = threading.Lock()
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301 self.boilerPlate(lock, lock.locked)
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302
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303 def testWithRLock(self):
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304 lock = threading.RLock()
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305 self.boilerPlate(lock, lock._is_owned)
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306
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307 def testWithCondition(self):
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308 lock = threading.Condition()
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309 def locked():
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310 return lock._is_owned()
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311 self.boilerPlate(lock, locked)
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312
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313 def testWithSemaphore(self):
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314 lock = threading.Semaphore()
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315 def locked():
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316 if lock.acquire(False):
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317 lock.release()
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318 return False
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319 else:
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320 return True
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321 self.boilerPlate(lock, locked)
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322
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323 def testWithBoundedSemaphore(self):
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324 lock = threading.BoundedSemaphore()
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325 def locked():
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326 if lock.acquire(False):
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327 lock.release()
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328 return False
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329 else:
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330 return True
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331 self.boilerPlate(lock, locked)
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332
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333 # This is needed to make the test actually run under regrtest.py!
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334 def test_main():
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335 with warnings.catch_warnings():
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336 warnings.simplefilter('ignore')
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337 test_support.run_unittest(__name__)
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338
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339 if __name__ == "__main__":
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340 test_main()