The way to read this diagram is it's as if it were my brain and I am facing this way.

查看这张示意图的方法是,设想这是我的大脑,面朝这个方向

耶鲁公开课 - 心理学导论课程节选

So another way saying it again is, when I call the class definition, by default I'm going to look to see is there an init method there, and if there is, I'm going to use it.

当我调用类的定义，默认的是语言要去查看，是不是有个init的方法,如果有的话，程序就会调用它，按照惯例。

麻省理工公开课 - 计算机科学及编程导论课程节选