getattr.c

static PyObject *
getattr_impl(PyObject *v, PyObject *name, int suppress)
{
    PyTypeObject *tp = Py_TYPE(v);
    PyObject *ret = NULL;

    if (!PyUnicode_Check(name)) {
        PyErr_Format(PyExc_TypeError,
                     "attribute name must be string, not '%.200s'",
                     name->ob_type->tp_name);
        return NULL;
    }
    if (tp->tp_getattro != NULL) {
        if (tp->tp_getattro == PyObject_GenericGetAttr) {
            ret = _PyObject_GenericGetAttrWithDict(v, name, NULL, suppress);
        }
        else {
            ret = (*tp->tp_getattro)(v, name);
        }
    }
    else if (tp->tp_getattr != NULL) {
        const char *name_str = PyUnicode_AsUTF8(name);
        if (name_str == NULL)
            return NULL;
        ret = (*tp->tp_getattr)(v, (char *)name_str);
    }
    else if (!suppress) {
        PyErr_Format(PyExc_AttributeError,
                     "'%.50s' object has no attribute '%U'",
                     tp->tp_name, name);
    }

    if (ret == NULL && suppress &&
            PyErr_ExceptionMatches(PyExc_AttributeError)) {
        PyErr_Clear();
    }
    return ret;
}

PyObject *
PyObject_GetAttr(PyObject *v, PyObject *name)
{
    return getattr_impl(v, name, 0);
}

PyObject *
_PyObject_GetAttrWithoutError(PyObject *v, PyObject *name)
{
    return getattr_impl(v, name, 1);
}