[Numpy-discussion] Numpy/Cython Google Summer of Code project idea
Fri Mar 7 11:50:24 CST 2008
Joris De Ridder wrote:
> Thanks. I've a few questions concerning the objections against ctypes.
It's not so much an abjection (I think), but the fact that pyrex/Cython
really are different beasts, with different goals.
> For ctypes your extensions needs to be
> compiled as a shared library,
The compiling isn't the key issue -- you're right, that's not too big a
deal, and Scons helps.
If your goal is primarily to wrap existing C code, then ctypes is a good
option. But if you are trying to write new code as extension modules,
then Cython helps with that a lot. You do need to "get" C, but you don't
actually have to write functional stand-alone C code.
> neither pyrex nor ctypes seem to be particularly user-
> friendly concerning Numpy ndarrays
True, though it looks like one of the goals of Cython is to make it more
user-friendly to numpy arrays -- I'm really looking forward to that.
I suppose an example might be in order here - does anyone have a small,
but not trivial, example of an extension that could be done with both
Ctypes and Cython that we could examine?
By the way, I know Greg Ewing was asked about better support for numpy
arrays in Pyrex, and he said "I'm *definitely* not going to
re-implement C++ templates!" -- is there talk of creating a way to write
extensions that could operate on numpy arrays of arbitrary type with Cython?
Christopher Barker, Ph.D.
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