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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Consider allowing frozendicts to be assigned to instance dicts","articleBody":"Currently, can make an assignment to an instance's `__dict__` attribute but the value must be an actual dict. It should allow `frozendict` as well.  \n\nThis would be useful for making immutable instances without the awkward work arounds used in frozen dataclasses.\n\n```python\n\u003e\u003e\u003e class Point:\n...     def __init__(self, x, y):\n...         self.__dict__ = frozendict(x=x, y=y)\n...\n        \n\u003e\u003e\u003e p = Point(10, 20)\nTraceback (most recent call last):\n  File \"\u003cpyshell#53\u003e\", line 1, in \u003cmodule\u003e\n    p = Point(10, 20)\n  File \"\u003cpyshell#52\u003e\", line 3, in __init__\n    self.__dict__ = frozendict(x=x, y=y)\nTypeError: __dict__ must be set to a dictionary, not a 'frozendict'\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-145123\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/rhettinger","@type":"Person","name":"rhettinger"},"datePublished":"2026-02-22T15:56:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/145119/cpython/issues/145119"}