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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Dataclasses without `__init__` no longer work in 3.14.1 due to #137711","articleBody":"# Bug report\n\n### Bug description:\n\nThe resolution for #137530, https://github.com/python/cpython/pull/137711 which was backported to 3.14 and included in 3.14.1, breaks dataclasses without `__init__`.\nAlthough 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.\n\n```python\nfrom dataclasses import dataclass, field\n\n@dataclass(slots=True, init=False)\nclass MyClass:\n    attr: int\n\n    def __new__(cls, attr: int) -\u003e Self:\n        self.attr = attr\n        return self\n```\n\nError message:\n``` pytb\n$ python3 dataclasses_issue.py\nTraceback (most recent call last):\n  File \"/home/erik/dataclasses_issue.py\", line 3, in \u003cmodule\u003e\n    @dataclass(slots=True, init=False)\n     ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py\", line 1426, in wrap\n    return _process_class(cls, init, repr, eq, order, unsafe_hash,\n                          frozen, match_args, kw_only, slots,\n                          weakref_slot)\n  File \"/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py\", line 1234, in _process_class\n    cls = _add_slots(cls, frozen, weakref_slot, fields)\n  File \"/home/erik/.pyenv/versions/3.14.1/lib/python3.14/dataclasses.py\", line 1401, in _add_slots\n    init_annotate = newcls.__init__.__annotate__\n                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAttributeError: 'wrapper_descriptor' object has no attribute '__annotate__'. Did you mean: '__getstate__'?\n```\n\n### CPython versions tested on:\n\n3.14.1\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-142223\n* gh-142277\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/emontnemery","@type":"Person","name":"emontnemery"},"datePublished":"2025-12-03T08:15:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":21},"url":"https://github.com/142214/cpython/issues/142214"}