```python >>> cubes.append(216) # add the cube of 6 >>> cubes.append(7 ** 3) # and the cube of 7 >>> cubes [1, 8, 27, 64, 125, 216, 343] ``` 为切片赋值可以改变列表大小,甚至清空整个列表: ```python >>> letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g']...