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annotate Lib/contextlib.py @ 39496:352ffe77b71d legacy-trunk

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Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 6bc1e83a97a6
children f474de973404 adb83f4ac4cb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Utilities for with-statement contexts. See PEP 343."""
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2
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3 import sys
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4
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5 __all__ = ["contextmanager", "nested", "closing"]
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6
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7 class GeneratorContextManager(object):
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8 """Helper for @contextmanager decorator."""
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9
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10 def __init__(self, gen):
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11 self.gen = gen
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12
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13 def __enter__(self):
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14 try:
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15 return self.gen.next()
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16 except StopIteration:
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17 raise RuntimeError("generator didn't yield")
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18
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19 def __exit__(self, type, value, traceback):
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20 if type is None:
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21 try:
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22 self.gen.next()
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23 except StopIteration:
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24 return
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25 else:
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26 raise RuntimeError("generator didn't stop")
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27 else:
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28 try:
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29 self.gen.throw(type, value, traceback)
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30 raise RuntimeError("generator didn't stop after throw()")
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31 except StopIteration, exc:
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32 # Suppress the exception *unless* it's the same exception that
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33 # was passed to throw(). This prevents a StopIteration
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34 # raised inside the "with" statement from being suppressed
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35 return exc is not value
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36 except:
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37 # only re-raise if it's *not* the exception that was
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38 # passed to throw(), because __exit__() must not raise
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39 # an exception unless __exit__() itself failed. But throw()
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40 # has to raise the exception to signal propagation, so this
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41 # fixes the impedance mismatch between the throw() protocol
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42 # and the __exit__() protocol.
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43 #
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44 if sys.exc_info()[1] is not value:
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45 raise
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48 def contextmanager(func):
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49 """@contextmanager decorator.
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50
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51 Typical usage:
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52
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53 @contextmanager
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54 def some_generator(<arguments>):
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55 <setup>
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56 try:
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57 yield <value>
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58 finally:
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59 <cleanup>
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60
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61 This makes this:
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62
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63 with some_generator(<arguments>) as <variable>:
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64 <body>
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65
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66 equivalent to this:
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67
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68 <setup>
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69 try:
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70 <variable> = <value>
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71 <body>
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72 finally:
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73 <cleanup>
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74
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75 """
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76 def helper(*args, **kwds):
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77 return GeneratorContextManager(func(*args, **kwds))
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78 try:
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79 helper.__name__ = func.__name__
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80 helper.__doc__ = func.__doc__
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81 helper.__dict__ = func.__dict__
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82 except:
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83 pass
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84 return helper
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85
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87 @contextmanager
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88 def nested(*managers):
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89 """Support multiple context managers in a single with-statement.
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90
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91 Code like this:
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92
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93 with nested(A, B, C) as (X, Y, Z):
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94 <body>
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95
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96 is equivalent to this:
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97
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98 with A as X:
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99 with B as Y:
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100 with C as Z:
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101 <body>
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102
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103 """
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104 exits = []
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105 vars = []
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106 exc = (None, None, None)
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107 try:
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108 try:
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109 for mgr in managers:
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110 exit = mgr.__exit__
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111 enter = mgr.__enter__
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112 vars.append(enter())
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113 exits.append(exit)
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114 yield vars
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115 except:
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116 exc = sys.exc_info()
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117 finally:
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118 while exits:
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119 exit = exits.pop()
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120 try:
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121 if exit(*exc):
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122 exc = (None, None, None)
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123 except:
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124 exc = sys.exc_info()
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125 if exc != (None, None, None):
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126 # Don't rely on sys.exc_info() still containing
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127 # the right information. Another exception may
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128 # have been raised and caught by an exit method
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129 raise exc[0], exc[1], exc[2]
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130
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131
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132 class closing(object):
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133 """Context to automatically close something at the end of a block.
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134
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135 Code like this:
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136
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137 with closing(<module>.open(<arguments>)) as f:
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138 <block>
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139
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140 is equivalent to this:
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141
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142 f = <module>.open(<arguments>)
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143 try:
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144 <block>
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145 finally:
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146 f.close()
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147
fa92fe15251a Updates to the with-statement:
Guido van Rossum <guido@python.org>
parents:
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148 """
37971
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Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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149 def __init__(self, thing):
af44db2a9523 Move the PEP 343 documentation and implementation closer to the
Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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150 self.thing = thing
af44db2a9523 Move the PEP 343 documentation and implementation closer to the
Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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151 def __enter__(self):
af44db2a9523 Move the PEP 343 documentation and implementation closer to the
Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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152 return self.thing
af44db2a9523 Move the PEP 343 documentation and implementation closer to the
Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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153 def __exit__(self, *exc_info):
af44db2a9523 Move the PEP 343 documentation and implementation closer to the
Nick Coghlan <ncoghlan@gmail.com>
parents: 37955
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154 self.thing.close()