Guido van Rossum <gu...@python.org> added the comment:
Ah, okay. I wasn't familiar with @total_ordering so I assumed differently.
Sorry for the continued misunderstanding.
Perhaps we should just leave it alone completely then, since ISTM that any
change to its implementation may cause subtle bugs in currently working code.
The problem you see only occurs when there are abstract ordering methods
present. The cure is simple, just implement all four comparison functions (and
do away with @total_ordering). This is not a great burden. Instead we should
probably add a line or two to the docs explaining how it interacts with ABCs
defining abstract ordering methods.
@dataclass uses a different approach ("is it defined in the current class?").
That is perfectly ready for a call to abc.update_abstractmethods(). (I checked,
and dataclasses already depends on abc, indirectly via functools, so the extra
import is free.)
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<https://bugs.python.org/issue41905>
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