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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH] Support F-contiguous `memoryview`s in `cast`","articleBody":"Currently [`memoryview.cast` requires C-contiguous data]( https://github.com/python/cpython/blob/7d8b69e1d1f125454d8cec81ff0dee72f2bef957/Objects/memoryobject.c#L1369-L1373 ) when going from N-D to 1-D. As a result F-contiguous data is not supported. Please see example below:\r\n\r\n```python\r\n\u003e\u003e\u003e mv.c_contiguous\r\nFalse\r\n\u003e\u003e\u003e mv.f_contiguous\r\nTrue\r\n\u003e\u003e\u003e mv.cast(\"B\")\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\nTypeError: memoryview: casts are restricted to C-contiguous views\r\n```\r\n\r\nHowever as F-contiguous data is still contiguous and can be viewed in 1-D, it seems possible to support this type of data as well. `PickleBuffer`'s `raw` method [does appear to support both C \u0026 F contiguous data]( https://github.com/python/cpython/blob/f4c03484da59049eb62a9bf7777b963e2267d187/Objects/picklebufobject.c#L156-L161 ). Building off the example above:\r\n\r\n```python\r\n\u003e\u003e\u003e from pickle import PickleBuffer\r\n\u003e\u003e\u003e pb = PickleBuffer(mv)\r\n\u003e\u003e\u003e pb.raw()\r\n\u003cmemory at 0x1105cec70\u003e\r\n```\r\n\r\nThis would be useful when interacting with other libraries that work with this kind of data. That said, don't know if there is other context behind the C-contiguous constraint that I may be missing here.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-137803\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/jakirkham","@type":"Person","name":"jakirkham"},"datePublished":"2022-04-12T20:39:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/91484/cpython/issues/91484"}