[Numpy-discussion] asanyarray vs. asarray

[Ralf Gommers]

On Mon, Oct 29, 2018 at 4:31 PM Chris Barker <chris.barker at noaa.gov> wrote:

> On Fri, Oct 26, 2018 at 7:12 PM, Travis Oliphant <teoliphant at gmail.com>
> wrote:
>
>
>>  agree that we can stop bashing subclasses in general.   The problem with
>> numpy subclasses is that they were made without adherence to SOLID:
>> https://en.wikipedia.org/wiki/SOLID.  In particular the Liskov
>> substitution principle:
>> https://en.wikipedia.org/wiki/Liskov_substitution_principle .
>>
>
> ...
>
>
>> did not properly apply them in creating np.matrix which clearly violates
>> the substitution principle.
>>
>
> So -- could a matrix subclass be made "properly"? or is that an example of
> something that should not have been a subclass?
>

The latter - changing the behavior of multiplication breaks the principle.

Ralf
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