您已经创建了一个名为 len 的列表，从这里可以看到以下事实:您可以对其进行索引:>

You have created a list named len as you can see here from the fact that you're able to index it:

len[i] = input()

很自然地， len 不再是获取列表长度的函数，从而导致您收到错误消息.

So naturally, len is no longer a function that gets the length of a list, leading to the error you receive.

解决方案:为您的 len 列表命名.

Solution: name your len list something else.