[pypy-dev] offtopic, ontopic, ...

[Martijn Faassen]

On Tue, Feb 14, 2012 at 4:19 PM, Armin Rigo <arigo at tunes.org> wrote:
> Hi Martijn,
>
> On Tue, Feb 14, 2012 at 14:47, Martijn Faassen <faassen at startifact.com> wrote:
>> But Cython-based code does talk to C APIs, so there is a problem.
>> Python code in PyPy needs to be able to interface with C APIs first in
>> order to generate the right stuff from Cython.
>
> That's not necessarily hard.  I believe that Cython code like this:
>
>   PyObject *x = PyDict_GetItem(y, key)
>
> can correspond "faithfully" to Python code like that --- if we assume
> that 'y' contains really a dict:
>
>   x = y[key]
>
> I don't know to what extend the whole C API can be mapped back to
> Python, but certainly the most common functions can.

Yes, that's the Python C API, but I was talking about other C APIs.
Take lxml, which uses the libxml2 APIs.

There is no way to map that to Python unless you use something like
ctypes (but ctypes is not considered to be right for this purpose).

Regards,

Martijn