capi-sig October 2012

capi-sig@python.org

10 participants
14 discussions

ANN: expy 0.6.5 released!
by Yingjie Lan 16 Apr '22

16 Apr '22

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 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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C API equivalent to abc.ABCMeta.register?
by Daniel Stutzbach 02 Mar '22

02 Mar '22

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 10 Jan '22

10 Jan '22

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Re: [capi-sig] A little push into the right direction
by Robert Steckroth 28 Oct '12

28 Oct '12

Alright, disregard this message. This appears to be easy enough with the use structs. Simply posted this in haste, sorry. On Sun, Oct 28, 2012 at 10:52 AM, Robert Steckroth <robertsteckroth(a)gmail.com> wrote: > Hello Gang, I am asking that one of you can point me into the correct direction. > I have a python module which has two objects with many methods and > attributes in each. > The two hypothetical objects are "house" and "tree". > E.g. Used like below: > import my_mod > h = my_mod.house() > t = my_mod.tree() > > They also contain attributes like: > h.color > t.height > > > I would like to pass the t object to a house.attach() method > e.g. h.attach(t) > and modify the attributes of t within the house object methods. What > is the best practice to reference separate objects in a module > which are passed in at the interpreter? Any thoughts are appreciated > as keywords and ideas > are easy to Google. > > Thank you, Robert. > > > > > > -- > Bust0ut, Surgemcgee: Systems Engineer --- > surgemcgee.com > Django_Teamplate3d -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d

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A little push into the right direction
by Robert Steckroth 28 Oct '12

28 Oct '12

Hello Gang, I am asking that one of you can point me into the correct direction. I have a python module which has two objects with many methods and attributes in each. The two hypothetical objects are "house" and "tree". E.g. Used like below: import my_mod h = my_mod.house() t = my_mod.tree() They also contain attributes like: h.color t.height I would like to pass the t object to a house.attach() method e.g. h.attach(t) and modify the attributes of t within the house object methods. What is the best practice to reference separate objects in a module which are passed in at the interpreter? Any thoughts are appreciated as keywords and ideas are easy to Google. Thank you, Robert. -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d

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Re: [capi-sig] Universal setter function not in docs?
by Stefan Behnel 27 Oct '12

27 Oct '12

Robert Steckroth, 27.10.2012 13:36: > Hello Gang, I am fresh to this list so, hello gang! I didn't know I was participating in a Gang. Maybe you meant someone else. > I have the need for a universal setter function to set objects. You are not very clear about what you want to achieve. What's "universal" about that setter function? Could you give an example? Stefan

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Re: [capi-sig] Universal setter function not in docs?
by Stefan Behnel 27 Oct '12

27 Oct '12

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Universal setter function not in docs?
by Robert Steckroth 27 Oct '12

27 Oct '12

Hello Gang, I am fresh to this list so, hello gang! ======================================== I have the need for a universal setter function to set objects. The documentation suggests that there is a way to use a void pointer to define object data for comparison. Unfortunately, there does not seem to be any examples on how to do this. This snippet only works with the `last` attribute of the object --> static int Noddy_setlast(Noddy *self, PyObject *value, void *closure) { if (value == NULL) { PyErr_SetString(PyExc_TypeError, "Cannot delete the last attribute"); return -1; } if (! PyString_Check(value)) { PyErr_SetString(PyExc_TypeError, "The last attribute value must be a string"); return -1; } Py_DECREF(self->last); Py_INCREF(value); self->last = value; return 0; } Is there any examples of a universal setter function for `PyGetSetDef` that would check a attribute type with the 3 argument in Noddy_setlast? Thank you. *From the docs* [http://docs.python.org/extending/newtypes.html] > `The getter function is passed a Noddy object and a “closure”, which is void pointer. In this case, the closure is ignored. (The closure supports an advanced usage in which definition data is passed to the getter and setter. This could, for example, be used to allow a single set of getter and setter functions that decide the attribute to get or set based on data in the closure.)` -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d

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Embedded Python seems broken on Mac OS X Mountain LIon
by Tom Epperly 24 Oct '12

24 Oct '12

I am trying to work with Apple Mountain Lion's install of Python 2.7. I have a language interoperability tool, Babel http://www.llnl.gov/CASC/components/, that used embedded Python when other languages are calling Python (c.g., C++ calling Python). My fundamental problem is that sys.path is not being initialized the same when I dlopen(libpython2.7.dylib) and initialize Python compared with how the sys.path is set when the Python executable is called directly. This causes Python to fail to load the numpy module used by Babel. bash-3.2$ /usr/bin/python2.7 -c "import sys; print sys.path; import numpy" > /tmp/out1 bash-3.2$ /usr/bin/python -c "import sys; print sys.path; import numpy" > /tmp/out2 bash-3.2$ cat /tmp/out1 ['', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages'] bash-3.2$ diff /tmp/out1 /tmp/out2 bash-3.2$ ls -al /usr/bin/python2.7 lrwxr-xr-x 1 root wheel 75 Aug 23 11:10 /usr/bin/python2.7 -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 Presumably, this C program that uses dlopen(), Py_Initialize, and Py_SimpleString should have exactly the same output. /** foo.c */ #include <dlfcn.h> #include <stdio.h> int main(int argc, char **argv) { // void *lptr = dlopen("/System/Library/Frameworks/Python.framework/Python", RTLD_NOW | RTLD_GLOBAL); void *lptr = dlopen("/System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib", RTLD_NOW | RTLD_GLOBAL); if (lptr) { void (*pyinit)(void) = dlsym(lptr, "Py_Initialize"); if (pyinit) { int (*runSimple)(const char *); (*pyinit)(); /* initialize Python */ runSimple = dlsym(lptr, "PyRun_SimpleString"); if (runSimple) { (*runSimple)("import sys ; print sys.path; import numpy"); } } else { fprintf(stderr, "Unable to locate Py_Initialize: %s\n", dlerror()); } } else { fprintf(stderr, "Error loading Python shared library: %s\n", dlerror()); } } bash-3.2$ gcc foo.c ; ./a.out ['/usr/lib/python27.zip', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-darwin', '/usr/lib/python2.7/plat-mac', '/usr/lib/python2.7/plat-mac/lib-scriptpackages', '/usr/Extras/lib/python', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload'] Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named numpy However as you see, it has a completely different sys.path. I can't seem to find a way to get it to initialize Python with the same sys.path. It seems like the libpython2.7.dylib is broken. I am at a loss on how to fix this or even who to ask for help. Regards, Tom Epperly

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capi-sig October 2012