Mercurial > cpython-lru_cache-weakref

annotate Lib/contextlib.py @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 1423834b72d8
children 787b969d37f0 260c8ed3f5df
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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 from functools import wraps
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5
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6 __all__ = ["contextmanager", "nested", "closing"]
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7
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8 class GeneratorContextManager(object):
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9 """Helper for @contextmanager decorator."""
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10
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11 def __init__(self, gen):
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12 self.gen = gen
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13
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14 def __enter__(self):
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15 try:
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16 return self.gen.next()
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17 except StopIteration:
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18 raise RuntimeError("generator didn't yield")
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19
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20 def __exit__(self, type, value, traceback):
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21 if type is None:
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22 try:
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23 self.gen.next()
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24 except StopIteration:
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25 return
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26 else:
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27 raise RuntimeError("generator didn't stop")
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28 else:
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29 if value is None:
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30 # Need to force instantiation so we can reliably
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31 # tell if we get the same exception back
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32 value = type()
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33 try:
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34 self.gen.throw(type, value, traceback)
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35 raise RuntimeError("generator didn't stop after throw()")
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36 except StopIteration, exc:
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37 # Suppress the exception *unless* it's the same exception that
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38 # was passed to throw(). This prevents a StopIteration
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39 # raised inside the "with" statement from being suppressed
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40 return exc is not value
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41 except:
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42 # only re-raise if it's *not* the exception that was
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43 # passed to throw(), because __exit__() must not raise
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44 # an exception unless __exit__() itself failed. But throw()
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45 # has to raise the exception to signal propagation, so this
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46 # fixes the impedance mismatch between the throw() protocol
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47 # and the __exit__() protocol.
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48 #
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49 if sys.exc_info()[1] is not value:
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50 raise
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52
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53 def contextmanager(func):
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54 """@contextmanager decorator.
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55
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56 Typical usage:
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57
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58 @contextmanager
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59 def some_generator(<arguments>):
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60 <setup>
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61 try:
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62 yield <value>
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63 finally:
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64 <cleanup>
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65
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66 This makes this:
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67
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68 with some_generator(<arguments>) as <variable>:
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69 <body>
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70
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71 equivalent to this:
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72
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73 <setup>
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74 try:
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75 <variable> = <value>
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76 <body>
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77 finally:
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78 <cleanup>
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79
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80 """
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81 @wraps(func)
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82 def helper(*args, **kwds):
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83 return GeneratorContextManager(func(*args, **kwds))
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84 return helper
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85
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86
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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 for mgr in managers:
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109 exit = mgr.__exit__
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110 enter = mgr.__enter__
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111 vars.append(enter())
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112 exits.append(exit)
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113 yield vars
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114 except:
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115 exc = sys.exc_info()
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116 finally:
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117 while exits:
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118 exit = exits.pop()
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119 try:
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120 if exit(*exc):
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121 exc = (None, None, None)
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122 except:
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123 exc = sys.exc_info()
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124 if exc != (None, None, None):
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125 # Don't rely on sys.exc_info() still containing
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126 # the right information. Another exception may
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127 # have been raised and caught by an exit method
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128 raise exc[0], exc[1], exc[2]
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129
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130
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131 class closing(object):
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132 """Context to automatically close something at the end of a block.
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133
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134 Code like this:
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135
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136 with closing(<module>.open(<arguments>)) as f:
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137 <block>
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138
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139 is equivalent to this:
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140
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141 f = <module>.open(<arguments>)
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142 try:
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143 <block>
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144 finally:
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145 f.close()
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146
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147 """
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148 def __init__(self, thing):
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149 self.thing = thing
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150 def __enter__(self):
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151 return self.thing
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152 def __exit__(self, *exc_info):
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153 self.thing.close()