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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent dataclass order behavior on Python 3.13+","articleBody":"# Bug report\n\n### Bug description:\n\nSemantics of dataclasses `__eq__` have changed in Python 3.13+, the semantic is now inconsistent with the `order=True` generated set of dunder methods on the same Python 3.13+ versions.\n\nRelated issues:\n#128294\n#120645\n\n```python\n@dataclasses.dataclass(order=True)\nclass Data:\n    a: float\n\nnan = float(\"nan\")\n\nassert not (Data(nan) \u003c Data(nan))\n# assert not (Data(nan) \u003c= Data(nan)), \"fails on 3.13 even though {\u003c, ==} are both False\"\nassert not (Data(nan) \u003e Data(nan))\n# assert not (Data(nan) \u003e= Data(nan)), \"fails on 3.13 even though {\u003e, ==} are both False\"\nassert (Data(nan) != Data(nan))\nassert not (Data(nan) == Data(nan))\n```\n\nProposed fix PR: #137497\n\n\n\n### CPython versions tested on:\n\n3.13\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-137497\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/gesslerpd","@type":"Person","name":"gesslerpd"},"datePublished":"2025-08-12T00:21:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/137658/cpython/issues/137658"}