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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add `frozen_default` parameter on `dataclass_transform`","articleBody":"# Feature or enhancement\r\n\r\nAdd a new `frozen_default` parameter to [`dataclass_transform`](https://peps.python.org/pep-0681/#dataclass-transform-parameters) similar to the existing `eq_default` and `order_default` parameters.\r\n\r\n# Pitch\r\n\r\n- Frozen dataclasses are very popular when working with Jax (`flax.struct.dataclass` and `tjax.dataclass`), so being able to indicate that they are frozen by default would improve the user experience.\r\n- `dataclass_transform` is currently supported by Pyright/Pylance and Pyre. Both teams are in favor of implementing this new parameter. Since `dataclass_transform` supports kwargs for experimentation/extensibility, Pyright was already able to [add support](https://github.com/microsoft/pyright/commit/bedc124c394f01bbdea79809953ceb0299d42a7b) for `frozen_default`.\r\n- All feedback on typing-sig has been in favor of this enhancement.\r\n\r\n# Previous discussion\r\n\r\nDiscussed in [typing-sig](https://mail.python.org/archives/list/typing-sig@python.org/thread/IKZULRE5UZVIN7B6IMFR2CXIF6RYIJ2O/).\n\n\u003c!-- gh-linked-prs -->\n### Linked PRs\n* gh-99958\n\u003c!-- /gh-linked-prs -->\n","author":{"url":"https://github.com/debonte","@type":"Person","name":"debonte"},"datePublished":"2022-12-02T20:12:12Z","url":"https://github.com/python/cpython/issues/99957"}