Provide `ctypes.memoryview_at()`

[rianhunter]

Feature or enhancement

Proposal:

It should be possible to easily make memoryview objects from pointer-able ctypes objects with an arbitrary length. In the same way we can currently use ctypes.string_at() to create bytes objects. The advantage of using memoryview objects is that we can elide a buffer copy.

import ctypes
a = (ctypes.c_ubyte * 10)()
ctypes.buffer_at(a, 10, True)[0] = 1
assert a[0] == 1
a[0] = 2
assert ctypes.buffer_at(a, 10, True)[0] == 2

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-112015: Implement ctypes.memoryview_at() #112018

[rianhunter]

Abandoned

[ncoghlan]

@encukou is taking up work on the associated PR. Thanks for taking it this far @rianhunter!

[encukou]

And it's in!
Thank you @rianhunter for the proposal and implementation, and all the reviewers for their insights.