On 4/14/2019 2:54 AM, Eric Wieser wrote: > I've recently been adding better support to Numpy 1.16 for > interoperability with ctypes. > > In doing so, I came across two bugs in the implementation of the > PEP3118 buffer interface within ctypes, affecting `Structure`s and > arrays. Rather than repeating the issue summaries here, I've linked > their tracker issues below, and the patches I filed to fix them. > * https://bugs.python.org/issue32782 (patch: > https://github.com/python/cpython/pull/5576) memoryview(object).itemsize is 0 when object is ctypes structure and format. C expert needed to review 30-line patch, most of which is error handling. Patch includes new tests and blurb. > * https://bugs.python.org/issue32780 (patch: > https://github.com/python/cpython/pull/5561) A partial fix for a more complicated memoryview, ctypes structure and format, and itemsize situation. > I've seen little to no response on either the bug tracker or the > github PRs regarding these, so at the recommendation of the "Lifecycle > of a Pull Request" am emailing this list. The problem is that the currently listed ctypes and memoryview experts are not currently active. > Without these fixes, numpy has no choice but to ignore the broken > buffer interface that ctypes provides, and instead try to parse the > ctypes types manually. The sooner this makes a CPython release, the > sooner numpy can remove those workarounds. -- Terry Jan Reedy
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