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Description
Bug report
Between 3.11.0 and 3.11.1, Enums whose values are namedtuple objects have their values converted to tuple, which drops the field names we expect to be able to use, causing AttributeErrors. Test cases below create a namedtuple and an enum whose values are instances of that tuple. In the 3.11.1 case, referencing the enum value likeNTEnum.NONE.value produces a tuple and not a namedtuple. In both cases,copy.copy preserves the namedtuple type.
It is not clear whether any item in the changelog or release notes references this change, nor could I quickly tell whether this was related to changes to address#93910.
Python 3.11.0 (main, Oct 24 2022, 18:26:48) [MSC v.1933 64 bit (AMD64)] on win32
>>>fromenumimportEnum>>>fromcollectionsimportnamedtuple>>>TTuple=namedtuple('TTuple','id a blist')>>>classNTEnum(Enum):...NONE=TTuple(0,0, [])...A=TTuple(1,2, [4])...B=TTuple(2,4, [0,1,2])... ...>>>NTEnum.NONE<NTEnum.NONE:TTuple(id=0,a=0,blist=[])>>>>NTEnum.NONE.valueTTuple(id=0,a=0,blist=[])>>> [x.valueforxinNTEnum][TTuple(id=0,a=0,blist=[]),TTuple(id=1,a=2,blist=[4]),TTuple(id=2,a=4,blist=[0,1,2])]>>>importcopy>>>x=TTuple(0,1, [7])>>>xTTuple(id=0,a=1,blist=[7])>>>copy.copy(x)TTuple(id=0,a=1,blist=[7])>>>copy.deepcopy(x)TTuple(id=0,a=1,blist=[7])>>>NTEnum.NONE.value.blist[]
Python 3.11.1 (tags/v3.11.1:a7a450f, Dec 6 2022, 19:58:39) [MSC v.1934 64 bit (AMD64)] on win32
>>>fromenumimportEnum>>>fromcollectionsimportnamedtuple>>>TTuple=namedtuple('TTuple','id a blist')>>>classNTEnum(Enum):...NONE=TTuple(0,0, [])...A=TTuple(1,2, [4])...B=TTuple(2,4, [0,1,2])... ...>>>NTEnum.NONE<NTEnum.NONE: (0,0, [])>>>>NTEnum.NONE.value(0,0, [])>>> [x.valueforxinNTEnum][(0,0, []), (1,2, [4]), (2,4, [0,1,2])]>>>importcopy>>>x=TTuple(0,1, [7])>>>xTTuple(id=0,a=1,blist=[7])>>>copy.copy(x)TTuple(id=0,a=1,blist=[7])>>>copy.deepcopy(x)TTuple(id=0,a=1,blist=[7])>>>NTEnum.NONE.value.blistTraceback (mostrecentcalllast):File"<pyshell#16>",line1,in<module>NTEnum.NONE.value.blistAttributeError:'tuple'objecthasnoattribute'blist'
Your environment
- CPython versions tested on: 3.11.0, 3.11.1
- Operating system and architecture: win64 (amd64)
- 3.11.0 additionally tested on linux
- 3.11.0, 3.11.1 tested in IDLE