Re: class attributes and inner classes in C extensions
I think you could as well, after PyType_Ready() is called, set it yourself with PyObject_SetAttrString(FooType, "Bar", FooBarType); You *may* have to cast the FooType and FooBarType to (PyObject *), to avoid compiler warnings. I tried this. Its shorter and and works fine, too. thanks for the proposal. - harold - -- I wish there was a knob on the TV to turn up the intelligence. There's a knob called "brightness", but it doesn't seem to work. -- Gallagher -- http://mail.python.org/mailman/listinfo/python-list
Re: class attributes and inner classes in C extensions
harold fellermann <[EMAIL PROTECTED]> writes: >> I am working on a C extension module that implements a bunch of >> classes. Everything >> works fine so far, but I cannot find any way to implement class >> attributes or inner >> classes. Consider you have the following lines of Python : >> >> class Foo : >> class Bar : >> pass >> >> spam = "foobar" >> >> How can this class be translated to a C extension? Is there anything >> comparable to >> PyMethodDef that can be used for other attributes than functions? > > O.k. I found it out now, and in order to improve the knwoledge base of > the mailing > list, I will answer my question myself. > > The PyTypeObject structure has a field tp_dict that holds the > dictionary of the class object. You can initialize it with a > dictionary that holds class attributes. If you provide a custom > dictiomary, you must do so _before_ PyType_Ready() is called, because > PyType_Ready adds other entries to this dictionary. I think you could as well, after PyType_Ready() is called, set it yourself with PyObject_SetAttrString(FooType, "Bar", FooBarType); You *may* have to cast the FooType and FooBarType to (PyObject *), to avoid compiler warnings. Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: class attributes and inner classes in C extensions
I am working on a C extension module that implements a bunch of
classes. Everything
works fine so far, but I cannot find any way to implement class
attributes or inner
classes. Consider you have the following lines of Python :
class Foo :
class Bar :
pass
spam = "foobar"
How can this class be translated to a C extension? Is there anything
comparable to
PyMethodDef that can be used for other attributes than functions?
O.k. I found it out now, and in order to improve the knwoledge base of
the mailing
list, I will answer my question myself.
The PyTypeObject structure has a field tp_dict that holds the
dictionary of the
class object. You can initialize it with a dictionary that holds class
attributes.
If you provide a custom dictiomary, you must do so _before_
PyType_Ready() is called,
because PyType_Ready adds other entries to this dictionary.
This is my C extension of the above. It works great for me:
static PyTypeObject FooType = {
/* ... snip ... */
0, // tp_dict
/* ... snip ... */
};
static PyTypeObject FooBarType = {
/* ... snip ... */
};
PyMODINIT_FUNC inithyper(void)
{
/*
the following lines add class attributes to the types tp_dict:
*/
FooType.tp_dict = PyDict_New();
PyDict_SetItemString(FooBarType,"Bar",(PyObject *)&FooBarType);
PyDict_SetItemString(FooBarType,"spam",PyString_FromString("foobar"));
PyObject* m;
if (PyType_Ready(&hFooType) < 0) return;
if (PyType_Ready(&hFooBarType) < 0) return;
m = Py_InitModule3("my_module", NULL, "some documentation");
Py_INCREF(&FooType);
PyModule_AddObject(m, "Foo", (PyObject *)&FooType);
Py_INCREF(&hyper_FooBarType);
PyModule_AddObject(m, "Bar", (PyObject *)&FooBarType);
}
Documentation for tp_dict can be found in the API:
http://docs.python.org/api/type-structs.html
- harold -
--
"2x2 = grün"
-- Heinz von Foerster
--
http://mail.python.org/mailman/listinfo/python-list
class attributes and inner classes in C extensions
Hello, I just posted this question with a wrong subject... So here again with a better one. I am working on a C extension module that implements a bunch of classes. Everything works fine so far, but I cannot find any way to implement class attributes or inner classes. Consider you have the following lines of Python : class Foo : class Bar : pass spam = "foobar" How can this class be translated to a C extension? Is there anything comparable to PyMethodDef that can be used for other attributes than functions? Thanks for your help, - harold - -- Always remember that you are unique; just like everyone else. -- -- http://mail.python.org/mailman/listinfo/python-list
