参考浅表副本
In [2]: nested_tuple = (1, [1, 2], 2)
In [3]: dup_nested_tuple = tuple(nested_tuple)
In [4]: dup_nested_tuple
Out[4]: (1, [1, 2], 2)
In [5]: dup_nested_tuple[1][1] = 100
In [6]: nested_tuple
Out[6]: (1, [1, 100], 2)
用C的细节实现的[1,2]内部列表是否作为指针?