Otherwise I'm going to check to see is the first and last, there's that - 1 indexing, is the first and last element of the string the same?

是第一个还是最后一个,这就是这边-1的索引内容，这个字符串的第一个,和最后一个的内容是否相同呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

You can also assign to a list, or to an element of a list. So ivy sub 1, f -15 or example, could be assigned minus 15, and that will actually mutate the list.

此外你还可以给一个数组，或者数组内部的元素赋值,比如ivy。sub，可以被赋值为，这确实改变了数组。

麻省理工公开课 - 计算机科学及编程导论课程节选