We're checking the end test and incrementing, actually I was going to, I commented that out for a reason you'll see in a second, but I, normally I would keep this on, which would let me, at each step, see what it's doing. If I ran this, it would print out each step. Which is helping me make sure that it's incrementing the right way.

对不对？进行终结测试然后递增，实际上我要，因为某些你们,马上要明白的原因我把这里注释了，但是我通常会一直这么做，这样能让我看到每一步都做了什么，如果我运行这个程序，它会在每一步都,进行显示，这能帮助我让我确信程序是,在以正确的方式递增。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, for example, if I say TEST and I don't give it a start but I give it an end, then it gives me all the elements up to that point.

例如，我创建了TEST这个元组我没有给他,起始点却给了它一个结束点,然后程序会基于这一点放置所有的元素。

麻省理工公开课 - 计算机科学及编程导论课程节选