# append & extend ###### tags: `python語法` List.extend(iterable) 將每個 iterator 加入 list ```python= xx = list(range(5)) xx [0, 1, 2, 3, 4] yy = list(range(2)) yy [0, 1] xx.extend(yy) xx [0, 1, 2, 3, 4, 0, 1] ``` List.append(object) 將 object 加入 list ```python= xx = list(range(5)) xx [0, 1, 2, 3, 4] yy = list(range(2)) yy [0, 1] xx.append(yy) xx [0, 1, 2, 3, 4, [0, 1]] ```