[Numpy-discussion] Equality not working as expected with ndarray sub-class
sebastian
sebastian at sipsolutions.net
Thu Jul 4 09:12:16 EDT 2013
On 2013-07-04 15:06, Thomas Robitaille wrote:
> Hi everyone,
>
> The following example:
>
> import numpy as np
>
> class SimpleArray(np.ndarray):
>
> __array_priority__ = 10000
>
> def __new__(cls, input_array, info=None):
> return np.asarray(input_array).view(cls)
>
> def __eq__(self, other):
> return False
>
> a = SimpleArray(10)
> print (np.int64(10) == a)
> print (a == np.int64(10))
>
> gives the following output
>
> $ python2.7 eq.py
> True
> False
>
> so that in the first case, SimpleArray.__eq__ is not called. Is this a
> bug, and if so, can anyone think of a workaround? If this is expected
> behavior, how do I ensure SimpleArray.__eq__ gets called in both
> cases?
>
This should be working in all development versions. I.e. NumPy >1.7.2
(which is not released yet).
- Sebastian
> Thanks,
> Tom
>
> ps: cross-posting to stackoverflow
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