Mercurial > cpython-lru_cache-weakref

annotate Lib/contextlib.py @ 66978:aed2bbafa550 3.1

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Blocked revisions 87324 via svnmerge ........ r87324 | r.david.murray | 2010-12-16 14:08:51 -0500 (Thu, 16 Dec 2010) | 9 lines #10719: restore messages generated on invalid compileall args Before the introduction of filename arguments to compileall it gave semi useful messages about not being able to 'list' names that weren't valid directories. This fix restores that behavior. In addition to the test for this case, the patch also adds a test for the default behavior of compileall when no arguments are provided, and fixes a bug in one of the previously added tests. ........
author R. David Murray <rdmurray@bitdance.com>
date Thu, 16 Dec 2010 19:10:16 +0000
parents 45506be44514
children e3fa2ddbb3a3
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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 next(self.gen)
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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 next(self.gen)
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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 as 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 # exc[1] already has the __traceback__ attribute populated
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130 raise exc[1]
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131
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132
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133 class closing(object):
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134 """Context to automatically close something at the end of a block.
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135
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136 Code like this:
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137
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138 with closing(<module>.open(<arguments>)) as f:
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139 <block>
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140
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141 is equivalent to this:
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142
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143 f = <module>.open(<arguments>)
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144 try:
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145 <block>
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146 finally:
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147 f.close()
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148
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149 """
38453
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150 def __init__(self, thing):
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151 self.thing = thing
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152 def __enter__(self):
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153 return self.thing
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154 def __exit__(self, *exc_info):
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155 self.thing.close()