OK, in fact if we look at this, if I say, print of p, it prints it out in that form.

好，实际上如果，我们来看看这个，如果我输入，p的显示。

麻省理工公开课 - 计算机科学及编程导论课程节选

It says, if I want to print out something I built in Cartesian form up here, says, again, I'm going to pass it in a pointer to the instance, that self thing, and then I'm going to return a string that I combine together with an open self and close paren, a comma in the middle, and getting the x-value and the y-value and converting them into strings before I put the whole thing together.

这不仅仅是个列表,它是怎么来做的？,流程是：如果我想要返回,一些已经在笛卡尔模式下建好的值，好，再说一遍，我首先要传入一个,指向实例的指针,也就是，然后我会返回一个,由开括号，闭括号,中间的一个逗号,以及提前转换为字符串格式的。

麻省理工公开课 - 计算机科学及编程导论课程节选

But if it does take input, you have to provide it in the form of arguments or parameters, like print F takes, generally, inside of those parentheses.

但是如果它获得了输入，你需要为它提供相应格式的,参数或参量，像printf的输入，一般地，在这些圆括号里。

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