[Numpy-discussion] numpy array change notifier?

Ryan May rmay31@gmail....
Mon Oct 27 16:45:12 CDT 2008


Brent Pedersen wrote:
> On Mon, Oct 27, 2008 at 1:56 PM, Robert Kern <robert.kern@gmail.com> wrote:
>> On Mon, Oct 27, 2008 at 15:54, Erik Tollerud <erik.tollerud@gmail.com> wrote:
>>> Is there any straightforward way of notifying on change of a numpy
>>> array that leaves the numpy arrays still efficient?
>> Not currently, no.
>>
>> --
>> 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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>>
> 
> out of curiosity,
> would something like this affect efficiency (and/or work):
> 
> class Notify(numpy.ndarray):
>     def __setitem__(self, *args):
>         self.notify(*args)
>         return super(Notify, self).__setitem__(*args)
> 
>     def notify(self, *args):
>         print 'notify:', args
> 
> 
> with also overriding setslice?

I haven't given this much thought, but you'd also likely need to do this
for the infix operators (+=, etc.).

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma


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