adding an attribute to an nd-array
Robert Kern
robert.kern at gmail.com
Thu Oct 19 11:54:42 EDT 2006
Travis Oliphant wrote:
> I just learned about how to allow built-ins to have attributes assigned
> to their instances. It's actually pretty easy because of Python
> support for it --- but it comes at a cost. You have to add a dictionary
> to the PyArrayObject structure, create that dictionary when the ndarray
> is allocated, and set the tp_dictoffset in the TypeObject structure to
> its location in PyArrayObject. It takes 4 lines of code with the cost of
> creating a new dictionary for every ndarray.
>
> I don't think the extra bytes for every ndarray object are worth it,
> given how easy it is to sub-class and create your own ndarray that can
> have attributes attached. What are others opinions.
I'd say leave it off. Many uses of that feature will require custom
__array_finalize__ methods anyways.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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