Mailman 3 April 2009 - capi-sig

ANNOUNCE: PyBindGen 0.8
by Gustavo Carneiro March 10, 2022

March 10, 2022

The other day I released PyBindGen 0.8. Main news is that it features a new experimental header file scanner based on pygccxml (i.e., it's similar to py++ in scope, if not in maturity, but does not use boost.pythonunderneath). == What == PyBindGen is a Python module that is geared to generating C/C++ code that binds a C/C++ library for Python. It does so without extensive use of either C++ templates or C pre-processor macros. It has modular handling of C/C++ types, and can be easily extended with Python plugins. The generated code is almost as clean as what a human programmer would write, and does not depend on any library or header files besides Python itself. == Where == https://launchpad.net/pybindgen/ == NEWS == - Support C++ instance attributes through getter/setter methods - Support functions as methods of C++ classes - Support the PyObject* type - Support unsigned int, C strings (char*) (from Mark Lee) - Add basic support for enum types - New experimental automatic module generator based on C/C++ header file scanner and annotations in comments, using pygccxml - Some bug fixes -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit "The universe is always one step beyond logic." -- Frank Herbert

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C API equivalent to abc.ABCMeta.register?
by Daniel Stutzbach March 2, 2022

March 2, 2022

I'm the author of an extension module (blist) that provides a type that fits the MutableSequence API. Is there a canonical way for me to register the type as a MutableSequence from the C API? -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>

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Garbage output from warnings with embedded python
by Campbell Barton May 29, 2009

May 29, 2009

Recently I wanted to deprecate some functions in our the C api, and found that warnings give weired output when running through through our C api. A simple test is to do this... print range(1.5) When I run this from python I get good output.. test.py:1: DeprecationWarning: integer argument expected, got float print range(1.5) But when running from our C api I get /home/ideasman42/blender-svn/blender/blender.bin:1: DeprecationWarning: integer argument expected, got float ELF�p40�"4()&44�4�44�4��F��F��F�K �K ğ<@G�K �K xxHH�H� P�td�2?��C ��C L,L,Q�td/lib/ld-linux.so.2GNU��8�1LQ �U�N�.yH {��d I thought this was todo with running a compiled string so I tried PyRun_String() on the text buffer instead of PyEval_EvalCode() but the same problem. Id be interested to know if anyones embedded python gives proper warnings. On Linux testing with python 2.6 here. -- - Campbell

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An unexpected visit_decref assertion violation (code works with 2.4, not with 2.5)
by Joe Ardent May 1, 2009

May 1, 2009

Hello, I have a Python module here that takes a bunch of C++ classes, and turns them into Python classes. When built against and loaded into Python 2.4, everything is fine. But when built against and loaded into Python 2.5, I get an assert violation from Python's gc module. Here is the code that is failing: klass = PyClass_New(bases, classDict, className); if (klass && methods) { /* add methods to class */ for (def = methods; def->ml_name != NULL; def++) { printf( "IlmPyClass: %d, def = %s\n", __LINE__, def->ml_name); PyObject *func = IlmPyClass_NewFunction(def); if (!func) { Py_XDECREF(klass); return NULL; } printf( "We get here\n" ); func = PyMethod_New(func, NULL, klass); //this line fails printf( "We don't get here\n" ); # ....... } } The output of 'python2.5 -c "import mymod"' is: """ [.... snip a bunch of "we get here, we don't get here" etc. as things fail to fail...] IlmPyClass: 197, def = __init__ We get here python2: Modules/gcmodule.c:276: visit_decref: Assertion `gc->gc.gc_refs != 0' failed. Abort """ The obvious things, such as Py_INCREFing klass or func, do not work. What's extra strange, in addition to this code working fine in an earlier python version, is that this code works fine for most of the classes that are instantiated. What I really want to do, though, is see what exactly is being decref'd. Does anyone have any tips for doing this? I've already tried using a debug build of Python; it doesn't seem to provide that type of ref tracing. Thanks in advance for any tips or insights. -- Joe Ardent

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PyFunction_New examples
by Trigve Siver April 7, 2009

April 7, 2009

Hi, I'm trying to use PyFunction_New() function but I've problem finding out how it works. What I'm trying to do is to create python function on the fly and then trying to create function object from if via PyFunction_New. My problems are similar to this: http://article.gmane.org/gmane.comp.python.general/548300/match=pyfunction_… Please CC me. thanks Trigve

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Python console in a C application
by Campbell Barton April 1, 2009

April 1, 2009

Hi there, for blender3d were going to have a built in python console, The console in Blender 2.4x I wrote a while ago and had no clue about the "code" module, or code.interact(), and apparently re-implemented parts of idle :| Ofcourse all the blender specific stuff is our problem, (events, text drawing etc), We can worry about that. Does anyone know of an example of a C application that has a python console? Some basic requirements are... * it runs inside blender (not using the terminal) * It doesn't lock blender IIRC the Gimp has a python console but it uses pygtk for this. -- - Campbell

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