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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`dataclasses.astuple` breaks on `DefaultDict`","articleBody":"# Bug report\r\n\r\nThis is very similar to https://github.com/python/cpython/issues/79721\r\n\r\n```python\r\nfrom dataclasses import dataclass, astuple\r\nfrom typing import DefaultDict, List\r\nfrom collections import defaultdict\r\n\r\n@dataclass\r\nclass C:\r\n    mp: DefaultDict[str, List]\r\n\r\ndd = defaultdict(list)\r\ndd[\"x\"].append(12)\r\nc = C(mp=dd)\r\nd = astuple(c)  # throws \"TypeError: first argument must be callable or None\"\r\n\r\n\r\nassert d == ({\"x\": [12]},)\r\nassert d[0] is not c.mp  # make sure defaultdict is copied\r\n```\r\n\r\nBasically applying the same fix for `asdict` from https://github.com/python/cpython/pull/32056 to `astuple`.\r\n\r\n# Your environment\r\n\r\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\r\n\r\n- CPython versions tested on: 3.10.7\r\n- Operating system and architecture: macOS, arm64\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-98170\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/kwsp","@type":"Person","name":"kwsp"},"datePublished":"2022-10-11T00:00:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/98169/cpython/issues/98169"}