Function _get_output_array_method

numpy/core/src/umath/ufunc_object.c:246–276

* Returns an incref'ed pointer to the proper __array_prepare__/__array_wrap__ * method for a ufunc output argument, given the output argument `obj`, and the * method chosen from the inputs `input_method`. */

 * method chosen from the inputs `input_method`.
 */
static PyObject *
_get_output_array_method(PyObject *obj, PyObject *method,
                         PyObject *input_method) {
    if (obj != Py_None) {
        PyObject *ometh;

        if (PyArray_CheckExact(obj)) {
            /*
             * No need to wrap regular arrays - None signals to not call
             * wrap/prepare at all
             */
            Py_RETURN_NONE;
        }

        ometh = PyObject_GetAttr(obj, method);
        if (ometh == NULL) {
            PyErr_Clear();
        }
        else if (!PyCallable_Check(ometh)) {
            Py_DECREF(ometh);
        }
        else {
            /* Use the wrap/prepare method of the output if it's callable */
            return ometh;
        }
    }

    /* Fall back on the input's wrap/prepare */
    Py_XINCREF(input_method);
    return input_method;
}

/*
 * This function analyzes the input arguments