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annotate Lib/contextlib.py @ 74006:88198b93ff2f

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Issue #13560: Add PyUnicode_EncodeLocale() * Use PyUnicode_EncodeLocale() in time.strftime() if wcsftime() is not available * Document my last changes in Misc/NEWS
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 17 Dec 2011 04:13:41 +0100
parents 8c17e898e0e8
children 8ef66c73b1e1
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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", "closing", "ContextDecorator"]
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7
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9 class ContextDecorator(object):
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10 "A base class or mixin that enables context managers to work as decorators."
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11
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12 def _recreate_cm(self):
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13 """Return a recreated instance of self.
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14
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15 Allows otherwise one-shot context managers like
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16 _GeneratorContextManager to support use as
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17 decorators via implicit recreation.
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18
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19 Note: this is a private interface just for _GCM in 3.2 but will be
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20 renamed and documented for third party use in 3.3
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21 """
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22 return self
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23
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24 def __call__(self, func):
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25 @wraps(func)
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26 def inner(*args, **kwds):
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27 with self._recreate_cm():
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28 return func(*args, **kwds)
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29 return inner
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30
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31
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32 class _GeneratorContextManager(ContextDecorator):
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33 """Helper for @contextmanager decorator."""
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34
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35 def __init__(self, func, *args, **kwds):
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36 self.gen = func(*args, **kwds)
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37 self.func, self.args, self.kwds = func, args, kwds
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38
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39 def _recreate_cm(self):
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40 # _GCM instances are one-shot context managers, so the
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41 # CM must be recreated each time a decorated function is
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42 # called
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43 return self.__class__(self.func, *self.args, **self.kwds)
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44
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45 def __enter__(self):
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46 try:
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47 return next(self.gen)
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48 except StopIteration:
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49 raise RuntimeError("generator didn't yield")
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50
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51 def __exit__(self, type, value, traceback):
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52 if type is None:
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53 try:
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54 next(self.gen)
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55 except StopIteration:
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56 return
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57 else:
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58 raise RuntimeError("generator didn't stop")
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59 else:
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60 if value is None:
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61 # Need to force instantiation so we can reliably
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62 # tell if we get the same exception back
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63 value = type()
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64 try:
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65 self.gen.throw(type, value, traceback)
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66 raise RuntimeError("generator didn't stop after throw()")
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67 except StopIteration as exc:
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68 # Suppress the exception *unless* it's the same exception that
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69 # was passed to throw(). This prevents a StopIteration
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70 # raised inside the "with" statement from being suppressed
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71 return exc is not value
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72 except:
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73 # only re-raise if it's *not* the exception that was
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74 # passed to throw(), because __exit__() must not raise
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75 # an exception unless __exit__() itself failed. But throw()
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76 # has to raise the exception to signal propagation, so this
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77 # fixes the impedance mismatch between the throw() protocol
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78 # and the __exit__() protocol.
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79 #
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80 if sys.exc_info()[1] is not value:
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81 raise
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82
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83
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84 def contextmanager(func):
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85 """@contextmanager decorator.
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86
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87 Typical usage:
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88
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89 @contextmanager
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90 def some_generator(<arguments>):
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91 <setup>
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92 try:
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93 yield <value>
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94 finally:
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95 <cleanup>
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96
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97 This makes this:
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98
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99 with some_generator(<arguments>) as <variable>:
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100 <body>
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101
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102 equivalent to this:
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103
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104 <setup>
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105 try:
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106 <variable> = <value>
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107 <body>
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108 finally:
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109 <cleanup>
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110
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111 """
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112 @wraps(func)
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113 def helper(*args, **kwds):
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114 return _GeneratorContextManager(func, *args, **kwds)
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115 return helper
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116
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117
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118 class closing(object):
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119 """Context to automatically close something at the end of a block.
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120
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121 Code like this:
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122
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123 with closing(<module>.open(<arguments>)) as f:
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124 <block>
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125
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126 is equivalent to this:
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127
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128 f = <module>.open(<arguments>)
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129 try:
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130 <block>
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131 finally:
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132 f.close()
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133
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134 """
38453
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135 def __init__(self, thing):
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136 self.thing = thing
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137 def __enter__(self):
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138 return self.thing
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139 def __exit__(self, *exc_info):
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140 self.thing.close()