Mailman 3 May 2013 - capi-sig

ANN: expy 0.6.5 released!
by Yingjie Lan April 16, 2022

April 16, 2022

EXPY is an express way to extend Python! EXPY provides a way to extend python in an elegant way. For more information and a tutorial, see: http://expy.sourceforge.net/ What's new: 1. Correct treatment of __init__ method. 2. Give warnings of missing Py_INCREF on appropriate special type methods. 3. Documentation update. Cheers, Yingjie

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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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Software Development - Application Development - Game Development
by Gary Jan. 10, 2022

Jan. 10, 2022

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Constructing variable arg tuples
by Todd Lyons May 21, 2013

May 21, 2013

Hi all, I'm embedding python into a c app (exim, the MTA). I've gotten code in to initialize python, read in the embedded script, call various functions within that script, and appropriately return data from those functions back to the exim call. One thing that does not make sense yet though, is how to assemble the data to be passed to the python functions. Imagine the following simple function: def simple_math(a,b): return a+b In this case, a and b are integers or long integers. How can I format that incoming data without knowing in advance that there are two arguments to this function and that are both are integers? If the reason for this question is not clear, imagine that the sysadmin goes and edits the python script so that it now is: def simple_math(name,a,b): // do something to log "name" to a logfile return a+b Now argument index 0 is a string, and indexes 1 and 2 are the integers. How does a calling c application deal with the fact that the variables to function can be, well, of variable types, and not known beforehand? It seems like there should be a python api function available which says "for $FUNC, are $ARGS valid arguments" or "for $FUNC, convert $ARGS to what $FUNC expects". Am I missing something simple here? ...Todd -- The total budget at all receivers for solving senders' problems is $0. If you want them to accept your mail and manage it the way you want, send it the way the spec says to. --John Levine

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Embedded python, adding a path to sys.path before import, strange observations
by Todd Lyons May 14, 2013

May 14, 2013

I was well on my way to sending a help request about "why can I not add a path to sys.path" in an embedded python instance (that I'm adding to a c app). I have test code from *three* different methods that should add a path to the sys.path object, but none of them _seemed_ to work. I highlight that word because the way I was testing is what seems to be flawed. All three methods turn out to work, but the way I was testing appears to be flawed. I was testing by comparing the output of Py_GetPath() before I adjusted the path, and then after I adjusted the path. It always shows the same. On a whim, I added a call to load a quickie python script in that extra subdirectory after I adjusted the path and I was FLOORED when loaded. I've been working on this for days thinking that it wasn't working because the output of Py_GetPath() did not indicate the new path I was adding. Question A: Is it normal that Py_GetPath() doesn't show the adjusted path? Method 1: PySys_GetObject("path"), PyList_Insert(), PySys_SetObject() with the new object Method 2: PyRun_SimpleString("import sys" "sys.path.append('blah')") Method 3: Py_GetPath(),append the syspath and new path together, PySys_SetPath() with the new string Question B: All three seem to work equally well, is there a reason to choose one over the other? All positive guidance and suggestions are welcome. Testing C code is quoted below, as well as the sample output from running it and an strace trimmed output to show that it does appear to be loading the module. Thanks for any comments, observations, or explanations. ...Todd py_testc: #include <Python.h> int main (int argc, char *argv[]) { char *path, *eximpath = "/etc/exim"; PyObject *syspath, *pName, *pModule; Py_SetProgramName("application"); Py_Initialize(); if (!Py_IsInitialized()) { printf("Error initializing Python interpreter\n"); return 1; } path = Py_GetPath(); printf("Python search path is:\n%s\n", path); syspath = PySys_GetObject("path"); if (syspath == 0) printf("Python failed to import sys\n"); printf("Adding %s\n", eximpath); pName = PyString_FromString(eximpath); if (PyList_Insert(syspath, 0, pName)) printf("Error inserting extra path into sys.path list\n"); if (PySys_SetObject("path", syspath)) printf("Error setting sys.path object\n"); pName = PyString_FromString("mod_python"); pModule = PyImport_Import(pName); Py_DECREF(pName); if (pModule == NULL) printf("Unable to import module\n"); else printf("Loaded module\n"); /* Still shows wrong path! But module still loads above. */ path = Py_GetPath(); printf("Modified Python search path is:\n%s\n", path); Py_DECREF(syspath); Py_Finalize(); return 0; } // vim:sw=2 ts=2 expandtab [todd@tlyons ~/python]$ ./py_test Python search path is: /usr/lib/python2.7/:/usr/lib/python2.7/plat-linux2:/usr/lib/python2.7/lib-tk:/usr/lib/python2.7/lib-old:/usr/lib/python2.7/lib-dynload Adding /etc/exim Loaded module Modified Python search path is: /usr/lib/python2.7/:/usr/lib/python2.7/plat-linux2:/usr/lib/python2.7/lib-tk:/usr/lib/python2.7/lib-old:/usr/lib/python2.7/lib-dynload [todd@tlyons ~/python]$ strace ./py_test 2>&1 | grep mod_python stat64("/etc/exim/mod_python", 0xbf9dfa58) = -1 ENOENT (No such file or directory) open("/etc/exim/mod_python.so", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/etc/exim/mod_pythonmodule.so", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/etc/exim/mod_python.py", O_RDONLY|O_LARGEFILE) = 3 open("/etc/exim/mod_python.pyc", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) unlink("/etc/exim/mod_python.pyc") = -1 ENOENT (No such file or directory) open("/etc/exim/mod_python.pyc", O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_LARGEFILE, 0100644) = -1 EACCES (Permission denied) -- The total budget at all receivers for solving senders' problems is $0. If you want them to accept your mail and manage it the way you want, send it the way the spec says to. --John Levine

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