gh-107538: [Enum] fix handling of inverted/negative values#132273
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For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0)
IntFlag will flip all bits -- this only makes a difference in flag sets with missing values.
negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
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ethanfurman merged commit 49365bd into python:main 39 checks passed
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edgarrmondragon commented Jul 11, 2025
Is there a chance for this to be backported to 3.14? |
AndPuQing pushed a commit to AndPuQing/cpython that referenced this pull request Jul 11, 2025
…honGH-132273) * Fix flag mask inversion when unnamed flags exist. For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0) * EJECT and KEEP flags (IntEnum is KEEP) use direct value. * correct Flag inversion to only flip flag bits IntFlag will flip all bits -- this only makes a difference in flag sets with missing values. * correct negative assigned values in flags negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
Pranjal095 pushed a commit to Pranjal095/cpython that referenced this pull request Jul 12, 2025
…honGH-132273) * Fix flag mask inversion when unnamed flags exist. For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0) * EJECT and KEEP flags (IntEnum is KEEP) use direct value. * correct Flag inversion to only flip flag bits IntFlag will flip all bits -- this only makes a difference in flag sets with missing values. * correct negative assigned values in flags negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
picnixz pushed a commit to picnixz/cpython that referenced this pull request Jul 13, 2025
…honGH-132273) * Fix flag mask inversion when unnamed flags exist. For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0) * EJECT and KEEP flags (IntEnum is KEEP) use direct value. * correct Flag inversion to only flip flag bits IntFlag will flip all bits -- this only makes a difference in flag sets with missing values. * correct negative assigned values in flags negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
taegyunkim pushed a commit to taegyunkim/cpython that referenced this pull request Aug 4, 2025
…honGH-132273) * Fix flag mask inversion when unnamed flags exist. For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0) * EJECT and KEEP flags (IntEnum is KEEP) use direct value. * correct Flag inversion to only flip flag bits IntFlag will flip all bits -- this only makes a difference in flag sets with missing values. * correct negative assigned values in flags negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
Agent-Hellboy pushed a commit to Agent-Hellboy/cpython that referenced this pull request Aug 19, 2025
…honGH-132273) * Fix flag mask inversion when unnamed flags exist. For example: class Flag(enum.Flag): A = 0x01 B = 0x02 MASK = 0xff ~Flag.MASK is Flag(0) * EJECT and KEEP flags (IntEnum is KEEP) use direct value. * correct Flag inversion to only flip flag bits IntFlag will flip all bits -- this only makes a difference in flag sets with missing values. * correct negative assigned values in flags negative values are no longer used as-is, but become inverted; i.e. class Y(self.enum_type): A = auto() B = auto() C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6 D = auto() assert Y.C. is Y.B|Y.D
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correct Flag inversion to only flip flag bits; IntFlag still flips all bits -- this
only makes a difference in flag sets with missing values.
correct negative assigned values in flags; negative values are no longer
used as-is, but become inverted; i.e.