[Numpy-discussion] Strange PyArray_FromObject() behavior

Val Kalatsky kalatsky@gmail....
Thu Feb 16 22:37:10 CST 2012


Hi Bill,

Looks like you are running a very fresh version of numpy.
Without knowing the build version and what's going on in the extension
module I can't tell you much.
The usual suspects would be:
1) Numpy bug, not too likely.
2) Incorrect use of PyArray_FromObject, you'll need to send more info.
3) Something is seriously corrupted, probably not the case, because
segfault would follow quickly.

Please provide more info.
Val

PS Is it something related to what we'll be working on (Trilinos)?


On Thu, Feb 16, 2012 at 11:09 AM, Spotz, William F <wfspotz@sandia.gov>wrote:

>  I have a user who is reporting tests that are failing on his platform.
>  I have not been able to reproduce the error on my system, but working with
> him, we have isolated the problem to unexpected results when
> PyArray_FromObject() is called.  Here is the chain of events:
>
>  In python, an integer is calculated.  Specifically, it is
>
>      len(result.errors) + len(result.failures)
>
>  where result is a unit test result object from the unittest module.  I
> had him verify that this value was in fact a python integer.  In my
> extension module, this PyObject gets passed to the PyArray_FromObject()
> function in a routine that comes from numpy.i.  What I expect, and what I
> typically get, is a numpy scalar array of type C long.  I had my user print
> the result using PyObject_Print() and what he got was
>
>      array([0:00:00], dtype=timedelta64[us])
>
>  I am stuck as to why this might be happening.  Any ideas?
>
>  Thanks
>
>  ** Bill Spotz                                              **
> ** Sandia National Laboratories  Voice: (505)845-0170      **
> ** P.O. Box 5800                 Fax:   (505)284-0154      **
> ** Albuquerque, NM 87185-0370    Email: wfspotz@sandia.gov **
>
>
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