from dataclasses import dataclass, field
@dataclass(slots=True, init=False)
class MyClass:
attr: int
def __new__(cls, attr: int) -> Self:
self.attr = attr
return self$ python3 dataclasses_issue.py
Traceback (most recent call last):
File "/home/erik/dataclasses_issue.py", line 3, in <module>
@dataclass(slots=True, init=False)
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py", line 1426, in wrap
return _process_class(cls, init, repr, eq, order, unsafe_hash,
frozen, match_args, kw_only, slots,
weakref_slot)
File "/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py", line 1234, in _process_class
cls = _add_slots(cls, frozen, weakref_slot, fields)
File "/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py", line 1401, in _add_slots
init_annotate = newcls.__init__.__annotate__
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'wrapper_descriptor' object has no attribute '__annotate__'. Did you mean: '__getstate__'?
Bug report
Bug description:
The resolution for #137530, #137711 which was backported to 3.14 and included in 3.14.1, breaks dataclasses without
__init__.Although a dataclass without
__init__doesn't seem that helpful, it doesn't seem to be explicitly forbidden and shouldn't break in a point release.Error message:
CPython versions tested on:
3.14.1
Operating systems tested on:
Linux
Linked PRs