[Numpy-discussion] Changes in PyArray_FromAny between 1.5.x and 1.6.x

Mike Hansen mhansen@gmail....
Mon Jun 4 14:06:04 CDT 2012


On Mon, May 28, 2012 at 3:15 AM, Mike Hansen <mhansen@gmail.com> wrote:
> In trying to upgrade NumPy within Sage, we notices some differences in
> behavior between 1.5 and 1.6.  In particular, in 1.5, we have
>
> sage: f = 0.5
> sage: f.__array_interface__
> {'typestr': '=f8'}
> sage: numpy.array(f)
> array(0.5)
> sage: numpy.array(float(f))
> array(0.5)
>
> In 1.6, we get the following,
>
> sage: f = 0.5
> sage: f.__array_interface__
> {'typestr': '=f8'}
> sage: numpy.array(f)
> array(0.500000000000000, dtype=object)
>
> This seems to be do to the changes in PyArray_FromAny introduced in
> https://github.com/mwhansen/numpy/commit/2635398db3f26529ce2aaea4028a8118844f3c48
> .  In particular, _array_find_type used to be used to query our
> __array_interface__ attribute, and it no longer seems to work.  Is
> there a way to get the old behavior with the current code?

Any ideas?

Thanks,
--Mike


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