capi-sig November 2008

capi-sig@python.org

9 participants
4 discussions

Compiling/Linking external Functions (setup.py, distutils, gcc?)

by Philipp Heuser

Hello all, I would like to use an existing C-Function from python. Therfore I made up an wrapper (wrap.c), where all the variable transformations from Python to C are done. That works. Now I would like to call the external fuction, which is placed in lets say ext_foo.a with a corresponding ext_foo.h and can be used as a library from plain C. I am assuming, that I do have to include the ext_foo.h in my wrap.c with #include "ext_foo.h" that I have to introduce the function in my C-Code: extern int foo(int); that I have to tell the setup.py using the distutils stuff where the library can be found... when compiling a C-Code which is not for python usage I do type gcc -o test.o ./test.c ./ext_foo.a -I./foo_h_file_path/ and everything is fine, where within these setup.py files do I have to mention the ./ext_foo.a ? When I do place it in the sources-tag, setup procedure complains that it doesn't know any .a files... if I don't mention it explicitly, just giving the include_dirs, compilation works fine, but when importing from python 'import wrap' I do get the message: Symbol not found: _foo Any help is very much appreciated! Thanks Philipp

12 years, 11 months

Re: [capi-sig] Beginner Question PyObject* to int

by KoDer

2008/11/12 Stefan Behnel <stefan_ml(a)behnel.de>: > Philipp Heuser wrote: >> I am just starting to use the C API for Python. What I want to do is to >> use an external funtion availabele in C and therfore I want to 'convert' >> a list of floats from Python to an array of floats in C > > Since you're just starting, it's generally worth looking into Cython > first, before investing time to learn the raw Python C-API. > > http://cython.org/ > Or http://cxx.sourceforge.net/ -- K.Danilov aka KoDer ICQ:214286120 Skype:koder.ua Tel:8-050-4030512 Jabber:koder_ua@jabber.ru

12 years, 11 months

Beginner Question PyObject* to int

by Philipp Heuser

Hi all, I am just starting to use the C API for Python. What I want to do is to use an external funtion availabele in C and therfore I want to 'convert' a list of floats from Python to an array of floats in C which I can forward to the external function. So first step is tp parse a list to C and let the C code print the variables! The obviously too simplistic approach is below... When I call this function from python, e.g. cpp([1,2,3]) the output is: 25180552 25180540 25180528 Could you be so kind to help me here to get started with using C-functions from Python? Where is the error? Thank you very much and kind regards, Philipp static PyObject * cpp_foo(PyObject *self, PyObject* args) { PyObject* obj; PyObject* seq; int i, len; if(!PyArg_ParseTuple(args, "O", &obj)) return NULL; seq = PySequence_Fast(obj, "expected a sequence"); len = PySequence_Size(obj); PyObject* item; int a; for (i=0; i<len; i++) { item=PySequence_Fast_GET_ITEM(seq, i); a=item; // ????????????????????????????????????????? printf("%i\n", a); } Py_DECREF(seq); return None; }

12 years, 11 months

Fwd: Can I build Python with lthread instead of pthread?

by Akira Kitada

suggested to try to ask capi-sig for this question. Forwarding. ---------- Forwarded message ---------- From: Aahz <aahz(a)pythoncraft.com> Date: Thu, Nov 6, 2008 at 1:08 AM Subject: Re: Can I build Python with lthread instead of pthread? To: python-list(a)python.org In article <mailman.3365.1225472233.3487.python-list(a)python.org>, Akira Kitada <akitada(a)gmail.com> wrote: > >I'm running Python 2.5 on FreeBSD 4. >pthread on FreeBSD 4 has some problems so I would like to build >python with lthread (linuxthreads) instead of BSD's pthread. >So I looked at configure options but couldn't find any options for it. >Python support lthread? and how can I build python with it? You may want to try asking on capi-sig -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ import antigravity -- http://mail.python.org/mailman/listinfo/python-list

12 years, 11 months

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capi-sig November 2008