PyObject_GetAttrString(object, "_type_marker");

PyObject_GetAttr(object, _type_marker_str);

PyObject *
PyObject_GetAttrString(PyObject *v, const char *name)
{
    PyObject *w, *res;

    if (Py_TYPE(v)->tp_getattr != NULL)
        return (*Py_TYPE(v)->tp_getattr)(v, (char*)name);
    w = PyUnicode_FromString(name);
    if (w == NULL)
        return NULL;
    res = PyObject_GetAttr(v, w);
    Py_DECREF(w);
    return res;
}

git grep PyObject_GetAttrString
bson/_cbsonmodule.c:187:    error = PyObject_GetAttrString(errors, name);
bson/_cbsonmodule.c:443:        imported = PyObject_GetAttrString(module, object_name);
bson/_cbsonmodule.c:460:    *object = PyObject_GetAttrString(module, object_name);
bson/_cbsonmodule.c:541:     * arbitrary types for a call to PyObject_GetAttrString. For example
bson/_cbsonmodule.c:568:    registry->encoder_map = PyObject_GetAttrString(registry_obj, "_encoder_map");
bson/_cbsonmodule.c:574:    registry->decoder_map = PyObject_GetAttrString(registry_obj, "_decoder_map");
bson/_cbsonmodule.c:580:    registry->fallback_encoder = PyObject_GetAttrString(registry_obj, "_fallback_encoder");
bson/_cbsonmodule.c:708:    py_flags = PyObject_GetAttrString(value, "flags");
bson/_cbsonmodule.c:717:    py_pattern = PyObject_GetAttrString(value, "pattern");
bson/_cbsonmodule.c:838:            subtype_object = PyObject_GetAttrString(value, "subtype");
bson/_cbsonmodule.c:886:            PyObject* pystring = PyObject_GetAttrString(value, "binary");
bson/_cbsonmodule.c:915:            PyObject* scope = PyObject_GetAttrString(value, "scope");
bson/_cbsonmodule.c:958:            obj = PyObject_GetAttrString(value, "inc");
bson/_cbsonmodule.c:971:            obj = PyObject_GetAttrString(value, "time");
bson/_cbsonmodule.c:1006:            PyObject* pystring = PyObject_GetAttrString(value, "bid");
bson/_cbsonmodule.c:1443:    bytes_obj = PyObject_GetAttrString(raw, "raw");
bson/_cbsonmodule.c:1619:        raw_bson_document_bytes_obj = PyObject_GetAttrString(dict, "raw");
bson/_cbsonmodule.c:2101:            replace = PyObject_GetAttrString(naive, "replace");
bson/_cbsonmodule.c:2136:                astimezone = PyObject_GetAttrString(value, "astimezone");
pymongo/_cmessagemodule.c:49:    error = PyObject_GetAttrString(errors, name);
pymongo/_cmessagemodule.c:369:    max_bson_size_obj = PyObject_GetAttrString(ctx, "max_bson_size");
pymongo/_cmessagemodule.c:376:    max_write_batch_size_obj = PyObject_GetAttrString(ctx, "max_write_batch_size");
pymongo/_cmessagemodule.c:383:    max_message_size_obj = PyObject_GetAttrString(ctx, "max_message_size");
pymongo/_cmessagemodule.c:670:    max_bson_size_obj = PyObject_GetAttrString(ctx, "max_bson_size");
pymongo/_cmessagemodule.c:682:    max_write_batch_size_obj = PyObject_GetAttrString(ctx, "max_write_batch_size");
pymongo/_cmessagemodule.c:692:    max_split_size_obj = PyObject_GetAttrString(ctx, "max_split_size");
pymongo/_cmessagemodule.c:965:    c_api_object = PyObject_GetAttrString(_cbson, "_C_API");