[Numpy-discussion] ndarray __getattr__ to perform __getitem__
Fri Oct 29 09:23:24 CDT 2010
On Oct 29, 2010, at 3:58 PM, Ian Stokes-Rees wrote:
>> Note that there are various extant projects that I think attempt to
>> provide similar functionality to what you're wanting (unless I badly
>> misread your original email, in which case apologies):
> Having looked into it more, I think recarray is probably what I want. I
> need to play with this and see how easy it is to convert ndarrays into
> The main thing is that I'm looking for something *really* simple that
> would, truly, just allow the conversion of:
Attribute-style access is IMHO the only interest of recarrays over regular structured arrays. Note that it comes to a cost...
> My suggestion is to define __getattr__ directly on the ndarray class.
> This is, TTBOMK, only called if an attribute is *not* found on the
> object. In this event, prior to throwing an AttributeError exception,
> the object could check to see if the specified attribute exists as a
> named axis/dimension of the multi-dimensional array, and if so, return
> this. Otherwise, carry on with the AttributeError exception.
> I've spent an hour looking at the numpy code (my first time), and I
> don't see any obvious way to do this, since ndarray is (AFAICT) a pure-C
> object with auto-generated wrappers, which seems to preclude (easily)
> adding a "__getattr__(self,attr)" method to the class. If someone can
> point me in the right direction, I'll keep looking into this, otherwise
> I'm giving up and will just try and use recarray.
Indeed. Check how recarray does it, for example.
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