define global in a python module from C api

Question

Sorry for the trivial question, but I can't find this infomation from the manual. I am developping a module for python using C api; how can I create a variabile that is seen as global from python? For example if my module is module I want to create a variable g that do this job:

import module
print module.g

in particular g is an integer.

Solution from Alex Martelli

PyObject *m = Py_InitModule("mymodule", mymoduleMethods);
PyObject *v = PyLong_FromLong((long) 23);

PyObject_SetAttrString(m, "g", v);
Py_DECREF(v);

Answer 1

You can use PyObject_SetAttrString in your module's initialization routine, with first argument o being (the cast to (PyObject*) of) your module, second argument attr_name being "g", third argument v being a variable

PyObject *v = PyLong_FromLong((long) 23);

(or whatever other value of course, 23 is just an example!-).

Do remember to decref v afterwards.

There are other ways, but this one is simple and general.