[SciPy-dev] Inclusion of cython code in scipy
Wed Apr 23 09:41:06 CDT 2008
On Wed, Apr 23, 2008 at 8:00 AM, Ondrej Certik <email@example.com> wrote:
> Isn't this a similar (if not the same) problem when writing your code
> using SWIG?
No, because the implementation (i.e. part that's harder to recreate)
is still written in C++.
> Let's take sparsetools.i as an example, it also contains a lot of non
> python, non C code. So one needs to depend (and maintain!) SWIG. Well,
> Cython is a lot more lightweight and more robust solution imho.
A lot? I took numpy.i from the NumPy repository, made a few changes,
and added sparsetools.i to generate the templates. If SWIG
disappeared overnight, I'd wrap *the very same, unmodified C++ code*
using another wrapper generator (perhaps Cython). If I wanted to use
sparsetools in another VHLL then I would wrap it for that one too.
OTOH if I had written sparsetools in Cython (as opposed to wrapping
sparsetools with Cython) and Cython disappeared, then I'd have to
rewrite the a substantial amount of the implementation.
Again, I think using Cython in place of SWIG is a fine thing to do. I
just wouldn't want write too much of it any more than I'd want to
write reams of hand-coded C wrappers or reams of SWIG.
> But even if Cython stays as yet another language -- it's still easier
> and less error prone than to write the C code by hand.
I don't disagree. However, writing C++ and wrapping with SWIG is also
easier than writing hand-coded extension modules, with the added
benefit of decoupling the core implementation from the interface.
Nathan Bell firstname.lastname@example.org
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