New submission from Antoine Pitrou <pit...@free.fr>:
This request is motivated in detail here: https://github.com/python/peps/pull/883#issuecomment-458290745 In short: in C, when you have a Py_buffer, you can directly read the memory in whatever order you want (including physical order). It is not possible in pure Python, though. Somewhat unintuitively, memoryview.tobytes() as well as bytes(memoryview) read bytes in *logical* order, even though it flattens the dimensions and doesn't keep the original type. Logical order is different from physical order for Fortran-contiguous arrays. One possible way of alleviating this would be to offer a memoryview.transpose() method, similar to the Numpy transpose() method (see https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.transpose.html). One could also imagine a memoryview.to_c_contiguous() method. Or even: a memoryview.raw_memory() method, that would 1) flatten dimensions 2) cast to 'B' format 3) keep physical order. ---------- components: Interpreter Core messages: 334491 nosy: pitrou, skrah priority: normal severity: normal stage: needs patch status: open title: Can't read a F-contiguous memoryview in physical order type: enhancement versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35845> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
