capi-sig May 2008

capi-sig@python.org

7 participants
5 discussions

ANNOUNCE: PyBindGen 0.8
by Gustavo Carneiro 10 Mar '22

10 Mar '22

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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Python parser
by Pablo Yabo 27 May '08

27 May '08

Hello, I embedded Python in an application to play with some objects. I want to add some features to my console and I don't find how to evaluate in the same way the Python console does. I want to let the user insert a: for a in [1,2,3]: and I want to put the '...' like the console but if I evaluate the 'for a in [1,2,3]:\n' using PyRun_SimpleString I get an error: File "<string>", line 1 for a in [1,2,3]: ^ SyntaxError: unexpected EOF while parsing Is there any way to evaluate in the same way the console does? Thanks in advance, Pablo Yabo

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Problems linking python25.lib into my executable using MSVC2008 Express
by Jeremy Friesner 22 May '08

22 May '08

Hi all, Apologies if this is a common question, I googled for it and couldn't find any good answers. I've got a C++ program that includes an embedded Python interpreter, and under Linux and MacOS/X everything works fine. It's a Qt4-based program, so all I needed to do was add -lpython2.5 to the LIBS variable in my .pro file. Now I'm trying to get the same program working under Windows, but when I get to the link stage I run into trouble. I've compiled the Python 2.5 library using MSVC2008 Express (and the project files in the PCBuild8 sub-folder), but when I try to link my own app (adding python25.lib to my LIBS line, of course), I get the errors shown below. I notice that I only get link errors about the global objects exported in the Python25.lib library (e.g. _PyList_Type)... I don't get any errors related to exported Python functions. Is there something special I need to do in order to get MSVC2008's linker to resolved exported global objects? Thanks, Jeremy e:\msvc2008\vc\bin\nmake.exe -f Makefile.Release link /LIBPATH:"e: \Qt\4.4.0\lib" /NOLOGO /LIBPATH:../../../../../software/3rdparty/libsndfile/win32 /LIBPATH:../../../../../software/3rdparty/libsamplerate/win32 /LIBPATH:../../../../../software/3rdparty/libsamplerate /LIBPATH:../../../../../software/3rdparty/python/pcbuild8/win32 /LIBPATH:../../../../../software/libs/muscle/zlib/zlib /INCREMENTAL:NO /MANIFEST /MANIFESTFILE:"objects\CueStation.intermediate.manifest" /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*' processorArchitecture='*'" /OUT:release\CueStation.exe @C: \DOCUME~1\JEREMY~1\LOCALS~1\Temp\nm48C.tmp PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyList_Type referenced in function "long __cdecl muscle::ParsePythonSequence(struct _object *,class muscle::Message &)" (?ParsePythonSequence@muscle@@YAJPAU_object@@AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol _PyList_Type PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyDict_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyUnicode_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyComplex_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyString_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol _PyString_Type SysexSubcueEditor.obj : error LNK2001: unresolved external symbol _PyString_Type PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyFloat_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyLong_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol _PyLong_Type PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyInt_Type referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol _PyInt_Type PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol __Py_NoneStruct referenced in function "long __cdecl muscle::AddPyObjectToMessage(class muscle::String const &,struct _object *,class muscle::Message &)" (?AddPyObjectToMessage@muscle@@YAJABVString@1@PAU_object@@AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol __Py_NoneStruct SysexSubcueEditor.obj : error LNK2001: unresolved external symbol __Py_NoneStruct PythonUtilityFunctions.obj : error LNK2019: unresolved external symbol _PyExc_RuntimeError referenced in function "long __cdecl muscle::ParsePythonArgs(struct _object *,struct _object *,class muscle::Message &)" (?ParsePythonArgs@muscle@@YAJPAU_object@@0AAVMessage@1@@Z) PythonTemplateUtilityFunctions.obj : error LNK2001: unresolved external symbol _PyExc_RuntimeError SysexSubcueEditor.obj : error LNK2001: unresolved external symbol _PyExc_RuntimeError PythonTemplateUtilityFunctions.obj : error LNK2019: unresolved external symbol __Py_TrueStruct referenced in function "long __cdecl qnet::RegenerateSysexDataFromTemplate(class qnet::IPythonTemplateEditor const &,class qnet::SysexEntry &)" (?RegenerateSysexDataFromTemplate@qnet@@YAJABVIPythonTemplateEditor@1@AAVSysexEntry@1@@Z) release\CueStation.exe : fatal error LNK1120: 11 unresolved externals

1 0

String to number conversion
by Hrvoje Niksic 07 May '08

07 May '08

I miss a function able to convert the string representation of a Python primitive number (int, long, float, complex) to an actual number, basically the reverse of repr for numbers. The only option I know of that doesn't involve inspecting the individual digits is eval, which doesn't cut it -- besides the obvious security implications, it tends to be slow when used en masse. What I have in mind is something along the lines of: >>> read_number('1') 1 >>> read_number('1.') 1.0 >>> read_number('3.14') 3.1400000000000001 >>> read_number('1000000000000000000') 1000000000000000000L >>> read_number('2+3j') (2+3j) >>> read_number('1e100') 1e+100 >>> read_number('bla') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid numeric value 'bla' A sample implementation, a variation of which I use in an in-house project, follows. It does inspect the string to determine its type, but does so in a simple C loop which is quite fast for numeric input. It leaves the actual conversion to the Python's API code that knows what it's doing. Because of that it's simple and fast, but still (to my knowledge) correct. PyObject * read_number(PyObject *str) { int isfloat = 0, iscomplex = 0; /* First, intuit the type based on characters that appear in the string. */ const char *s = PyString_AS_STRING(str); const char *end = s + PyString_GET_SIZE(str); const char *q; for (q = s; q < end; q++) { char c = *q; if (c == '.' || c == 'e') isfloat = 1; else if (c == 'j') iscomplex = 1; else if (c != '-' && c != '+' && !isdigit(c) && !isspace(c)) { PyErr_Format(PyExc_ValueError, "invalid numeric value '%s'", s); return NULL; } } /* Now that the type is known, construct the number, leaving the actual error checking to the constructors. */ if (iscomplex) return PyObject_CallFunctionObjArgs((PyObject *) &PyComplex_Type, str); else if (isfloat) return PyFloat_FromString(str, NULL); else /* handles ints and longs */ return PyInt_FromString((char *) s, NULL, 10); } Would anyone else find this kind of function useful?

4 9

Announcement: Smisk – web service framework in C controlled by Python
by Rasmus Andersson 07 May '08

07 May '08

http://trac.hunch.se/smisk Please let me know what you think! -- Rasmus Andersson

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capi-sig May 2008