python_3.11_exceptions.c

static PyObject *
BaseException_add_note(PyObject *self, PyObject *note)
{
    if (!PyUnicode_Check(note)) {
        PyErr_Format(PyExc_TypeError,
                     "note must be a str, not '%s'",
                     Py_TYPE(note)->tp_name);
        return NULL;
    }

    if (!PyObject_HasAttr(self, &_Py_ID(__notes__))) {
        PyObject *new_notes = PyList_New(0);
        if (new_notes == NULL) {
            return NULL;
        }
        if (PyObject_SetAttr(self, &_Py_ID(__notes__), new_notes) < 0) {
            Py_DECREF(new_notes);
            return NULL;
        }
        Py_DECREF(new_notes);
    }
    PyObject *notes = PyObject_GetAttr(self, &_Py_ID(__notes__));
    if (notes == NULL) {
        return NULL;
    }
    if (!PyList_Check(notes)) {
        Py_DECREF(notes);
        PyErr_SetString(PyExc_TypeError, "Cannot add note: __notes__ is not a list");
        return NULL;
    }
    if (PyList_Append(notes, note) < 0) {
        Py_DECREF(notes);
        return NULL;
    }
    Py_DECREF(notes);
    Py_RETURN_NONE;
}

PyDoc_STRVAR(add_note_doc,
"Exception.add_note(note) --\n\
    add a note to the exception");