Mailman 3 July 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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ctypes on Windows/AMD64
by Ulf Worsoe July 30, 2009

July 30, 2009

Hi, I currently developing a cross-platform interface using python ctypes, and it looks like all relevant platforms are supported except 64bit Windows. I haven't been able to find any (recent) information on why ctypes is not included in the .MSI and .ZIP archives for win64 from Python.org... Does anybody know why this is the case, and possibly if there's any plans for supporting it? Regards, Ulf Worsøe Mosek ApS

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Create new object
by Shaun Savage July 27, 2009

July 27, 2009

I am trying to create a new python object of type Foo from a C program. typedef struct ( PyObject_HEAD PyObject ...., ... } Foo; static PyTypeObject FooType = { PyObject_HEAD_INIT(NULL) 0, "foo.Foo", sizeof(Foo), 0, ... } in the code i have self = (Foo*) PyObject_CallObject((PyObject*)&FooType, NULL); if (self == NULL) It segFaults when a change the args to Py_None it returns NULL I have tried to create empty tuple args nothing works Any Ideas? shaun

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Re: [capi-sig] expy: an expressway to extend Python
by Yingjie Lan July 22, 2009

July 22, 2009

--- On Wed, 7/22/09, Philip Semanchuk <philip(a)semanchuk.com> wrote: > From: Philip Semanchuk <philip(a)semanchuk.com> > Subject: Re: [capi-sig] expy: an expressway to extend Python > To: capi-sig(a)python.org > Date: Wednesday, July 22, 2009, 6:11 PM > > On Jul 21, 2009, at 12:19 AM, Yingjie Lan wrote: > > > > > Hi All, > > > > This is to announce the initial release of expy > 0.1.0. > > > > More details at http://expy.sourceforge.net/ > > Hi Yingjie, > Well done; this looks interesting. There is a lot of > repetition involved in building a Python extension and > anything that reduces that is worth a look. > Hi Philip: thanks for the encouraging words, and I also felt the same pain and this is why I wanted to get this done. Hope more people feeling the same pain would also like this project. > BTW there's a typo here: > http://expy.sourceforge.net/extypes.html#defining-a-new-extension-type > > "imetohd to decalre" should be "imethod to declare". You're > typing too fast. =) Thanks, just way too fast, two typos in a row, hoho. Just corrected, might need a reload to see. Regards, Yingjie

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create a new subclass data type in C
by Shaun Savage July 22, 2009

July 22, 2009

Hi I can create a new object in C. Now I am trying to create a class and sub classes in C. I plan to use PyType_GenericNew() to create the base class. PyTypeObject myClass_Type = { ... }; myClassObj = PyTYpe_GenericNew(myClass, ...); How do I create something like class myNewClass(myClass): in C?

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expy: an expressway to extend Python
by Yingjie Lan July 22, 2009

July 22, 2009

Hi All, This is to announce the initial release of expy 0.1.0. More details at http://expy.sourceforge.net/ Thanks! Yingjie

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Re: [capi-sig] [Python-Dev] expy: an expressway to extend Python
by Yingjie Lan July 21, 2009

July 21, 2009

Hi, Here is a brief example on how to use expy to implement the math module: (for more details, see http://expy.sf.net/) """Python math module by expy-cxpy.""" from expy import * expymodule(__name__) #includes, defines, etc. @prologue def myprolog(): return """ #include <math.h> """ @function(double) #return type: double def sqrt(x=double): #argument x: double """sqrt(x) --> the square root of x.""" return "sqrt(x)" #as an expression #a more terse way @function(double) def sin(x=double): """sin(x) --> the sin of x.""" pass #the deduced call: sin(x) #more functions ... expymodule(__name__) #end of module

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Announce: PyBindGen 0.11 released
by Gustavo Carneiro July 12, 2009

July 12, 2009

To integrate some recent contributions, here's a new PyBindGen 0.11 release. About: PyBindGen is a Python bindings generator written in Python. Download: http://code.google.com/p/pybindgen/ Summary of changes: - Generate code that supports GCC's -fvisibility=hidden - Add rudimentary support for std::map containers - Some inplace numeric operators now supported (J. Michael Owen) - Partial sequence protocol support: __len__, __getitem__, and __setitem__ (J. Michael Owen) - Partially support pointer-to-container parameters - Call traceback.extract_stack() less often (faster on win32) - No need for GIL locking in attribute setters (thanks Stuart Stock) - Allow wrapping enum given list of (name, value) pairs - New foreign_cpp_namespace option, for wrapping classes outside our module's C++ namespace - Add a docstring parameter to CppMethod constructor (Robin Gilks) Also add a docstring parameter for CppClass - Better support for typedefs - Implement support for enum reference parameters - Add support for size_t "by-value" type -- 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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Problem with uuid package when embedding a python interpreter
by Jérôme Fuselier July 2, 2009

July 2, 2009

Hello, I've sent this message to the c.l.python newsgroup and someone pointed me to this mailing-list to find a solution. (http://groups.google.com/group/comp.lang.python/browse_thread/thread/346d6e…) I've tried to import a script in an embedded python intrepreter but this script fails when it imports the uuid module. I have a segmentation fault in Py_Finalize(). Here is a simple program which imitate my problem. main.c : #include "Python.h" void test() { Py_Initialize(); PyImport_Import(PyString_FromString("uuid")); Py_Finalize(); } main(int argc, char **argv) { for (i=0 ; i < 10; i++) test(); } For my application, I have to call Py_initialize and Py_Finalize several times so factorizing them in the main function is not an easy solution for me. The core which is produced gives me this error : Program terminated with signal 11, Segmentation fault. #0 0x00190ef6 in type_dealloc (type=0x291320) at Objects/typeobject.c: 2609 2609 _PyObject_GC_UNTRACK(type); Thanks for your help Jerome

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