[Numpy-discussion] deprecating assignment to ndarray.data

[Juan Nunez-Iglesias]

Does this apply in any way to the .data attribute in scipy.sparse matrices?
I fiddle with that quite often!

On Fri, Jan 22, 2016 at 11:21 AM, Nathaniel Smith <njs at pobox.com> wrote:

> So it turns out that ndarray.data supports assignment at the Python
> level, and what it does is just assign to the ->data field of the
> ndarray object:
>
> https://github.com/numpy/numpy/blob/master/numpy/core/src/multiarray/getset.c#L325
>
> This kind of assignment been deprecated at the C level since 1.7, and
> is totally unsafe -- if there are any views pointing to the array when
> this happens, then they'll be left pointing off into unallocated
> memory.
>
> E.g.:
>
> a = np.arange(10)
> b = np.linspace(0, 1, 10)
> c = a.view()
> a.data = b.data
> # Now c points into free'd memory
>
> Can we deprecate or just remove this?
>
> (Also filed issue: https://github.com/numpy/numpy/issues/7093)
>
> -n
>
> --
> Nathaniel J. Smith -- https://vorpus.org
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