Mercurial > cpython-lru_cache-weakref

annotate Lib/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
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 from functools import wraps
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5 from warnings import warn
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6
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7 __all__ = ["contextmanager", "nested", "closing"]
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8
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9 class GeneratorContextManager(object):
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10 """Helper for @contextmanager decorator."""
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11
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12 def __init__(self, gen):
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13 self.gen = gen
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14
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15 def __enter__(self):
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16 try:
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17 return self.gen.next()
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18 except StopIteration:
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19 raise RuntimeError("generator didn't yield")
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20
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21 def __exit__(self, type, value, traceback):
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22 if type is None:
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23 try:
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24 self.gen.next()
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25 except StopIteration:
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26 return
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27 else:
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28 raise RuntimeError("generator didn't stop")
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29 else:
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30 if value is None:
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31 # Need to force instantiation so we can reliably
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32 # tell if we get the same exception back
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33 value = type()
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34 try:
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35 self.gen.throw(type, value, traceback)
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36 raise RuntimeError("generator didn't stop after throw()")
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37 except StopIteration, exc:
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38 # Suppress the exception *unless* it's the same exception that
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39 # was passed to throw(). This prevents a StopIteration
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40 # raised inside the "with" statement from being suppressed
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41 return exc is not value
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42 except:
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43 # only re-raise if it's *not* the exception that was
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44 # passed to throw(), because __exit__() must not raise
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45 # an exception unless __exit__() itself failed. But throw()
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46 # has to raise the exception to signal propagation, so this
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47 # fixes the impedance mismatch between the throw() protocol
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48 # and the __exit__() protocol.
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49 #
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50 if sys.exc_info()[1] is not value:
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51 raise
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52
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53
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54 def contextmanager(func):
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55 """@contextmanager decorator.
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56
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57 Typical usage:
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58
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59 @contextmanager
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60 def some_generator(<arguments>):
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61 <setup>
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62 try:
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63 yield <value>
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64 finally:
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65 <cleanup>
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66
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67 This makes this:
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68
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69 with some_generator(<arguments>) as <variable>:
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70 <body>
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71
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72 equivalent to this:
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73
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74 <setup>
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75 try:
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76 <variable> = <value>
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77 <body>
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78 finally:
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79 <cleanup>
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80
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81 """
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82 @wraps(func)
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83 def helper(*args, **kwds):
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84 return GeneratorContextManager(func(*args, **kwds))
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85 return helper
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86
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87
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88 @contextmanager
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89 def nested(*managers):
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90 """Combine multiple context managers into a single nested context manager.
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91
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92 This function has been deprecated in favour of the multiple manager form
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93 of the with statement.
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94
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95 The one advantage of this function over the multiple manager form of the
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96 with statement is that argument unpacking allows it to be
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97 used with a variable number of context managers as follows:
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98
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99 with nested(*managers):
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100 do_something()
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101
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102 """
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103 warn("With-statements now directly support multiple context managers",
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104 DeprecationWarning, 3)
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105 exits = []
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106 vars = []
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107 exc = (None, None, None)
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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
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148 """
37971
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149 def __init__(self, thing):
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150 self.thing = thing
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151 def __enter__(self):
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152 return self.thing
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153 def __exit__(self, *exc_info):
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154 self.thing.close()