Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

PyModule_Add() allows to make such macro much simpler:

#define MOD_ADD(name, expr) \
    do { \
        if (PyModule_Add(mod, name, expr) < 0) { \
            return -1; \
        } \
    } while (0)

PyModule_AddObjectRef() is just Py_XINCREF() followed by PyModule_Add(). But 
since most values added to the module are new references, Py_XINCREF() is 
usually not needed. The PyModule_Add* API is a convenient API. It is not 
necessary, you can use PyModule_GetDict() + PyDict_SetItemString(), but with 
this API it is easier. And PyModule_Add() is a correct PyModule_AddObject() 
(which was broken a long time ago and cannot be fixed now) and is more 
convenient than PyModule_AddObjectRef().

PyModule_AddIntConstant() and PyModule_AddStringConstant() can be easily 
expressed in terms of PyModule_Add():

    PyModule_Add(m, name, PyLong_FromLong(value))
    PyModule_Add(m, name, PyUnicode_FromString(value))

And it is easy to combine it with other functions: PyLong_FromLongLong(), 
PyLong_FromUnsignedLong(), PyLong_FromVoidPtr(), PyFloat_FromDouble(), 
PyCapsule_New(), PyType_FromSpec(), etc.

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42327>
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