[Numpy-discussion] asanyarray vs. asarray
ralf.gommers at gmail.com
Mon Oct 29 23:54:17 EDT 2018
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>
>> 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.
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