Coverage for /pythoncovmergedfiles/medio/medio/usr/lib/python3.9/__future__.py: 91%

1"""Record of phased-in incompatible language changes. 

2 

3Each line is of the form: 

4 

5 FeatureName = "_Feature(" OptionalRelease "," MandatoryRelease "," 

6 CompilerFlag ")" 

7 

8where, normally, OptionalRelease < MandatoryRelease, and both are 5-tuples 

9of the same form as sys.version_info: 

10 

11 (PY_MAJOR_VERSION, # the 2 in 2.1.0a3; an int 

12 PY_MINOR_VERSION, # the 1; an int 

13 PY_MICRO_VERSION, # the 0; an int 

14 PY_RELEASE_LEVEL, # "alpha", "beta", "candidate" or "final"; string 

15 PY_RELEASE_SERIAL # the 3; an int 

16 ) 

17 

18OptionalRelease records the first release in which 

19 

20 from __future__ import FeatureName 

21 

22was accepted. 

23 

24In the case of MandatoryReleases that have not yet occurred, 

25MandatoryRelease predicts the release in which the feature will become part 

26of the language. 

27 

28Else MandatoryRelease records when the feature became part of the language; 

29in releases at or after that, modules no longer need 

30 

31 from __future__ import FeatureName 

32 

33to use the feature in question, but may continue to use such imports. 

34 

35MandatoryRelease may also be None, meaning that a planned feature got 

36dropped. 

37 

38Instances of class _Feature have two corresponding methods, 

39.getOptionalRelease() and .getMandatoryRelease(). 

40 

41CompilerFlag is the (bitfield) flag that should be passed in the fourth 

42argument to the builtin function compile() to enable the feature in 

43dynamically compiled code. This flag is stored in the .compiler_flag 

44attribute on _Future instances. These values must match the appropriate 

45#defines of CO_xxx flags in Include/compile.h. 

46 

47No feature line is ever to be deleted from this file. 

48""" 

49 

50all_feature_names = [ 

51 "nested_scopes", 

52 "generators", 

53 "division", 

54 "absolute_import", 

55 "with_statement", 

56 "print_function", 

57 "unicode_literals", 

58 "barry_as_FLUFL", 

59 "generator_stop", 

60 "annotations", 

61] 

62 

63__all__ = ["all_feature_names"] + all_feature_names 

64 

65# The CO_xxx symbols are defined here under the same names defined in 

66# code.h and used by compile.h, so that an editor search will find them here. 

67# However, they're not exported in __all__, because they don't really belong to 

68# this module. 

69CO_NESTED = 0x0010 # nested_scopes 

70CO_GENERATOR_ALLOWED = 0 # generators (obsolete, was 0x1000) 

71CO_FUTURE_DIVISION = 0x20000 # division 

72CO_FUTURE_ABSOLUTE_IMPORT = 0x40000 # perform absolute imports by default 

73CO_FUTURE_WITH_STATEMENT = 0x80000 # with statement 

74CO_FUTURE_PRINT_FUNCTION = 0x100000 # print function 

75CO_FUTURE_UNICODE_LITERALS = 0x200000 # unicode string literals 

76CO_FUTURE_BARRY_AS_BDFL = 0x400000 

77CO_FUTURE_GENERATOR_STOP = 0x800000 # StopIteration becomes RuntimeError in generators 

78CO_FUTURE_ANNOTATIONS = 0x1000000 # annotations become strings at runtime 

79 

80 

81class _Feature: 

82 

83 def __init__(self, optionalRelease, mandatoryRelease, compiler_flag): 

84 self.optional = optionalRelease 

85 self.mandatory = mandatoryRelease 

86 self.compiler_flag = compiler_flag 

87 

88 def getOptionalRelease(self): 

89 """Return first release in which this feature was recognized. 

90 

91 This is a 5-tuple, of the same form as sys.version_info. 

92 """ 

93 return self.optional 

94 

95 def getMandatoryRelease(self): 

96 """Return release in which this feature will become mandatory. 

97 

98 This is a 5-tuple, of the same form as sys.version_info, or, if 

99 the feature was dropped, is None. 

100 """ 

101 return self.mandatory 

102 

103 def __repr__(self): 

104 return "_Feature" + repr((self.optional, 

105 self.mandatory, 

106 self.compiler_flag)) 

107 

108 

109nested_scopes = _Feature((2, 1, 0, "beta", 1), 

110 (2, 2, 0, "alpha", 0), 

111 CO_NESTED) 

112 

113generators = _Feature((2, 2, 0, "alpha", 1), 

114 (2, 3, 0, "final", 0), 

115 CO_GENERATOR_ALLOWED) 

116 

117division = _Feature((2, 2, 0, "alpha", 2), 

118 (3, 0, 0, "alpha", 0), 

119 CO_FUTURE_DIVISION) 

120 

121absolute_import = _Feature((2, 5, 0, "alpha", 1), 

122 (3, 0, 0, "alpha", 0), 

123 CO_FUTURE_ABSOLUTE_IMPORT) 

124 

125with_statement = _Feature((2, 5, 0, "alpha", 1), 

126 (2, 6, 0, "alpha", 0), 

127 CO_FUTURE_WITH_STATEMENT) 

128 

129print_function = _Feature((2, 6, 0, "alpha", 2), 

130 (3, 0, 0, "alpha", 0), 

131 CO_FUTURE_PRINT_FUNCTION) 

132 

133unicode_literals = _Feature((2, 6, 0, "alpha", 2), 

134 (3, 0, 0, "alpha", 0), 

135 CO_FUTURE_UNICODE_LITERALS) 

136 

137barry_as_FLUFL = _Feature((3, 1, 0, "alpha", 2), 

138 (4, 0, 0, "alpha", 0), 

139 CO_FUTURE_BARRY_AS_BDFL) 

140 

141generator_stop = _Feature((3, 5, 0, "beta", 1), 

142 (3, 7, 0, "alpha", 0), 

143 CO_FUTURE_GENERATOR_STOP) 

144 

145annotations = _Feature((3, 7, 0, "beta", 1), 

146 (3, 10, 0, "alpha", 0), 

147 CO_FUTURE_ANNOTATIONS)