[Numpy-discussion] Deprecating ndarray.tostring()

[Eric Wieser]

Hi all,

Just a heads up that in https://github.com/numpy/numpy/pull/15867 I plan to
deprecate ndarray.tostring(), which is just a confusing way to spell
ndarray.tobytes().

This function has been documented as a compatibility alias since NumPy 1.9,
but never emitted a warning upon use.
Given array.array.tostring() has been warning as far back as Python 3.1, it
seems like we should follow suit.

In order to reduce the impact of such a deprecation, I’ve filed the
necessary scipy PR: https://github.com/scipy/scipy/pull/11755.
It’s unlikely we’ll remove this function entirely any time soon, but the
act of deprecating it may cause a few failing CI runs in projects where
warnings are turned into errors.

Eric
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