[Numpy-discussion] subclassing float64 (and friends)

Stefan van der Walt stefan at sun.ac.za
Fri Jan 5 05:22:58 CST 2007


On Wed, Jan 03, 2007 at 05:12:40PM -0600, eric jones wrote:
> Thanks for the update.  For now, I'll try doing what I need to by 
> sub-classing float.  But, I'm gonna miss __array_finalize__ :-).

Looks like r3493 is intended to fix this.  The 'view' method works
now, but I still see

In [2]: import numpy as N

In [3]: x = N.float64(12)

In [4]: class Floaty(N.float64):
   ...:     def __new__(subclass,data):
   ...:         return data.view(subclass)

In [6]: Floaty(x)
Out[6]: 12.0

In [7]: type(Floaty(x))
Out[7]: <type 'numpy.float64'>


versus


In [8]: class Ary(N.ndarray):
   ...:     def __new__(subclass,data):
   ...:         return data.view(subclass)

In [9]: Ary(N.array([1]))
Out[9]: Ary([1])

In [10]: type(Ary(N.array([1])))
Out[10]: <class '__main__.Ary'>


Cheers
Stéfan


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