[Numpy-discussion] state of G3F2PY?

william ratcliff william.ratcliff at gmail.com
Tue Jun 16 12:19:31 EDT 2009

I would be interested in testing your GSOC project and will do what I can in
the mean time.  I do develop on windows, but the library lives on linux,
macos, and windows, so we can test on anyg--it also binds with ifort,
gfortran, etc. so seems rather robust.


On Tue, Jun 16, 2009 at 12:13 PM, Kurt Smith <kwmsmith at gmail.com> wrote:

> On Tue, Jun 16, 2009 at 8:21 AM, william
> ratcliff<william.ratcliff at gmail.com> wrote:
> > Hi!  I'm looking at trying to bind a rather large (>150K lines of code)
> > crystallography library to python and would like to know what the state
> of
> > F2py is.  Are allocatable arrays supported?  Derived types?  Modules,
> > Pointers, etc.?  Is there a list somewhere?  Has anyone else looked into
> > wrapping such a large code base?  If so, any pointers?
> I've never used the current distributed version of f2py (numpy.f2py I
> believe is the default one) to wrap a library as large as this, and I
> don't believe that f2py can handle assumed-shape arrays as arguments
> to routines -- I haven't checked its support for allocatable, though,
> but I don't think so.  I'm certainly open to correction, though.  In
> my experience, f2py excels at wrapping Fortran 77-style programs with
> older array passing conventions, where the shape information is passed
> in as arguments to a subroutine/function.
> It won't solve your problem currently, but you might be interested in
> my GSoC project which aims to do just what you want -- binding a
> fortran library to Cython/Python, with support for
> allocatable/assumed-shape/assumed-size array arguments, pointers,
> derived types, modules, etc.  It is being heavily developed as we
> speak, but will (hopefully) be usable by sometime this fall.
> Your library seems pretty large, which would be an excellent test for
> the GSoC project.  If you are willing, and when the project is ready
> to tackle such a library, we'd be glad to work with you to get your
> library wrapped.  As mentioned, we won't be at this point until the
> fall, though.
> Pearu has been kind enough to let us use the 'fparser' module from the
> G3F2PY project as the fortran parser, so the work of f2py continues on
> in our GSoC work.
> There are a few software requrirements -- we've tried to keep
> dependencies to a minimum:
> 1) a fortran compiler that supports the intrinsic ISO_C_BINDING module
> -- gfortran 4.3.3 supports it, as do pretty much every current version
> of other compilers.
> 2) The GSoC project is distributed with Cython.
> 3) Python version >= 2.5.
> 4) Hopefully you're not on windows -- we certainly plan on supporting
> Windows at some point in the future, but we don't have access to it
> for testing right now.
> Hope this helps,
> Kurt Smith
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