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Bug in 3.14.1 Release: Dataclass triggers exception when init=False and slots=True #142251
Closed as duplicate
Description
Bug report
Bug description:
Reproducible with:
from dataclasses import dataclass
@dataclass(init=False, slots=True)
class SomeClass:
test: intStack trace:
Traceback (most recent call last):
File ".../reproduce_issue.py", line 4, in <module>
@dataclass(init=False, slots=True)
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.14/3.14.1/Frameworks/Python.framework/Versions/3.14/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 "/opt/homebrew/Cellar/python@3.14/3.14.1/Frameworks/Python.framework/Versions/3.14/lib/python3.14/dataclasses.py", line 1234, in _process_class
cls = _add_slots(cls, frozen, weakref_slot, fields)
File "/opt/homebrew/Cellar/python@3.14/3.14.1/Frameworks/Python.framework/Versions/3.14/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__'?
CPython versions tested on:
3.14
Operating systems tested on:
macOS
Activity
[-]Bug in 3.14.1 Release: Dataclass triggers exception[/-][+]Bug in 3.14.1 Release: Dataclass triggers exception when init=False and slots=True[/+]StanFromIreland commentedon Dec 4, 2025
This seems to be a very recent regression, not present in 3.14.0 or 3.13.9.
mkrd commentedon Dec 4, 2025
Yes, I know that it works on 3.14.0. Not really sure, but it might have been introduced in #137530
cmaloney commentedon Dec 4, 2025
I think this is a duplicate of gh-142214
hugovk commentedon Dec 4, 2025
Bisects to 12837c6 / #137711.
hugovk commentedon Dec 4, 2025
And the fix #142223 for #142214 fixes this.
Thanks for the report, let's mark as a duplicate.
__init__no longer work in 3.14.1 due to #137711 #142214