I'm using more and more often such macro:

#define MOD_ADD(name, expr) \
    do { \
        PyObject *obj = (expr); \
        if (obj == NULL) { \
            return -1; \
        } \
        if (PyModule_AddObjectRef(mod, name, obj) < 0) { \
            Py_DECREF(obj); \
            return -1; \
        } \
        Py_DECREF(obj); \
    } while (0)

Would PyModule_Add() replace such macro?