[Numpy-discussion] Re: Trouble installing numarray on Solaris
jmiller at stsci.edu
Mon Jul 4 17:27:54 EDT 2005
On Mon, 2005-07-04 at 18:59 +0200, Thomas Heller wrote:
> Todd Miller <jmiller at stsci.edu> writes:
> > On Mon, 2005-07-04 at 13:40 +0200, Thomas Heller wrote:
> >> Todd Miller <jmiller at stsci.edu> writes:
> >> > On Fri, 2005-07-01 at 15:02 -0700, Russell E. Owen wrote:
> >> >> A user of my application reports that installing numarray 1.3.2 on
> >> >> Solaris using Python 2.3.1 has run into trouble:
> >> >>
> >> >> prompt> python
> >> >> Python 2.3.1 (#1, Sep 30 2003, 20:29:58) [C] on sunos5
> >> >> Type "help", "copyright", "credits" or "license" for more information.
> >> >> >>> import numarray
> >> >> Fatal Python error: Call to API function without first calling
> >> >> import_libnumarray() in Src/_convmodule.c
> >> >> Abort (core dumped)
> >> >
> >> > It looks vaguely like an binary API mismatch of some kind... or one of
> >> > you numarray modules is stale or broken. To restate the obvious, it's
> >> > likely that numarray won't import (in C!) because import_libnumarray()
> >> > is very defintely in _convmodule.c. Since it's there and the API
> >> > pointer was not initialized, the libnumarray import failed.
> >> To the numarray authors/maintainers: Isn't it a bit harsh to call
> >> Py_FatalError() in the init function?
> > That's an interesting observation... the old recourse was to dump core
> > by calling through a NULL function pointer. :-)
> > Since this error can occur in the context of any API function, possibly
> > called from any sub-function within an extension function, I'm not sure
> > there is a soft & general way to handle it: getting it implies the
> > function must fail but that can't always be reported. I'm open to
> > suggestions... it's just not obvious to me how to handle it better.
> Maybe I was confusing numarray and numeric. In numeric's
> _numpymodule.c, function init_numpy(), there is this
> if (PyErr_Occurred()) goto err;
> Py_FatalError("can't initialize module _numpy");
> Sorry for the confusion.
> > I've concluded that the message is overly specific and may shorten it to
> > just the facts: "call through NULL numarray C-API pointer in <module>."
> Wouldn't it be possible to raise an exception - that would make it
> easier to find the bug?
The two cases where this error have been triggered are:
1. A bug in a C extension module which an author will catch before
release. An exception is not worth much there.
2. A corrupted numarray installation which will no longer import. I
agree it would be nice there.
But... it's hard to raise an exception because the failure macro would
have to handle a variety of different return values, even no return
value. I don't see how to do it without too much extra complexity for a
relatively rare problem.
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