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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add support for numpy buffer format `Zf` and `Zd`","articleBody":"* Python 3.14 added `D` and `F` formats to the ctypes and `struct` module\n* Python 3.15 adds `D` and `F` formats to the `array` module and to `memoryview`\n\nThe `D` and `F` formats were chosen for [compatibility with numpy](https://github.com/python/cpython/pull/132827). Problem: in fact, numpy uses buffer formats `Zd` and `Zf`. Example:\n\n```py\n\u003e\u003e\u003e import numpy as np\n\u003e\u003e\u003e memoryview(np.array([1, 2, 3], dtype='F')).format\n'Zf'\n\u003e\u003e\u003e memoryview(np.array([1, 2, 3], dtype='D')).format\n'Zd'\n```\n\nSo I propose adding support for `Zd` and `Zf` formats in `array`, `ctypes`, `memoryview` and `struct`. It requires changing the code expecting a single character to now accept a string (`Zd` and `Zf` have 2 characters!).\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-148676\n* gh-148674\n* gh-149368\n* gh-149455\n* gh-149778\n* gh-149779\n* gh-149869\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2026-04-17T11:53:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/148675/cpython/issues/148675"}