Mercurial > cpython-lru_cache-weakref

annotate Lib/__future__.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 cc9e5ddd8220
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Record of phased-in incompatible language changes.
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2
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3 Each line is of the form:
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4
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5 FeatureName = "_Feature(" OptionalRelease "," MandatoryRelease ","
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6 CompilerFlag ")"
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7
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8 where, normally, OptionalRelease < MandatoryRelease, and both are 5-tuples
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9 of the same form as sys.version_info:
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10
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11 (PY_MAJOR_VERSION, # the 2 in 2.1.0a3; an int
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12 PY_MINOR_VERSION, # the 1; an int
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13 PY_MICRO_VERSION, # the 0; an int
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14 PY_RELEASE_LEVEL, # "alpha", "beta", "candidate" or "final"; string
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15 PY_RELEASE_SERIAL # the 3; an int
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16 )
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17
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18 OptionalRelease records the first release in which
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19
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20 from __future__ import FeatureName
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21
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22 was accepted.
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23
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24 In the case of MandatoryReleases that have not yet occurred,
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25 MandatoryRelease predicts the release in which the feature will become part
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26 of the language.
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27
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28 Else MandatoryRelease records when the feature became part of the language;
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29 in releases at or after that, modules no longer need
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30
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31 from __future__ import FeatureName
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32
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33 to use the feature in question, but may continue to use such imports.
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34
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35 MandatoryRelease may also be None, meaning that a planned feature got
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36 dropped.
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37
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38 Instances of class _Feature have two corresponding methods,
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39 .getOptionalRelease() and .getMandatoryRelease().
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40
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41 CompilerFlag is the (bitfield) flag that should be passed in the fourth
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42 argument to the builtin function compile() to enable the feature in
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43 dynamically compiled code. This flag is stored in the .compiler_flag
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44 attribute on _Future instances. These values must match the appropriate
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45 #defines of CO_xxx flags in Include/compile.h.
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46
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47 No feature line is ever to be deleted from this file.
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48 """
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49
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50 all_feature_names = [
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51 "nested_scopes",
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52 "generators",
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53 "division",
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54 "absolute_import",
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55 "with_statement",
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56 "print_function",
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57 "unicode_literals",
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58 ]
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59
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60 __all__ = ["all_feature_names"] + all_feature_names
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61
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62 # The CO_xxx symbols are defined here under the same names used by
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63 # compile.h, so that an editor search will find them here. However,
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64 # they're not exported in __all__, because they don't really belong to
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65 # this module.
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66 CO_NESTED = 0x0010 # nested_scopes
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67 CO_GENERATOR_ALLOWED = 0 # generators (obsolete, was 0x1000)
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68 CO_FUTURE_DIVISION = 0x2000 # division
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69 CO_FUTURE_ABSOLUTE_IMPORT = 0x4000 # perform absolute imports by default
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70 CO_FUTURE_WITH_STATEMENT = 0x8000 # with statement
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71 CO_FUTURE_PRINT_FUNCTION = 0x10000 # print function
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72 CO_FUTURE_UNICODE_LITERALS = 0x20000 # unicode string literals
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73
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74 class _Feature:
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75 def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
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76 self.optional = optionalRelease
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77 self.mandatory = mandatoryRelease
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78 self.compiler_flag = compiler_flag
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79
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80 def getOptionalRelease(self):
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81 """Return first release in which this feature was recognized.
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82
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83 This is a 5-tuple, of the same form as sys.version_info.
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84 """
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85
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86 return self.optional
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87
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88 def getMandatoryRelease(self):
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89 """Return release in which this feature will become mandatory.
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90
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91 This is a 5-tuple, of the same form as sys.version_info, or, if
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92 the feature was dropped, is None.
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93 """
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94
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95 return self.mandatory
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96
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97 def __repr__(self):
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98 return "_Feature" + repr((self.optional,
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99 self.mandatory,
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100 self.compiler_flag))
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101
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102 nested_scopes = _Feature((2, 1, 0, "beta", 1),
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103 (2, 2, 0, "alpha", 0),
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104 CO_NESTED)
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105
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106 generators = _Feature((2, 2, 0, "alpha", 1),
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107 (2, 3, 0, "final", 0),
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108 CO_GENERATOR_ALLOWED)
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109
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110 division = _Feature((2, 2, 0, "alpha", 2),
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111 (3, 0, 0, "alpha", 0),
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112 CO_FUTURE_DIVISION)
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113
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114 absolute_import = _Feature((2, 5, 0, "alpha", 1),
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115 (3, 0, 0, "alpha", 0),
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116 CO_FUTURE_ABSOLUTE_IMPORT)
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117
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118 with_statement = _Feature((2, 5, 0, "alpha", 1),
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119 (2, 6, 0, "alpha", 0),
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120 CO_FUTURE_WITH_STATEMENT)
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121
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122 print_function = _Feature((2, 6, 0, "alpha", 2),
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123 (3, 0, 0, "alpha", 0),
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124 CO_FUTURE_PRINT_FUNCTION)
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125
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126 unicode_literals = _Feature((2, 6, 0, "alpha", 2),
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127 (3, 0, 0, "alpha", 0),
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128 CO_FUTURE_UNICODE_LITERALS)