在清单10中，找到了文件emptyfile，所以test返回0；但是没有找到文件badfilename，所以返回1。

In Listing 10, the file emptyfile was found, so test returned 0; the file badfilename was not found, so 1 was returned.

youdao

So there's a return branch on every possible path through the code. And that's valuable, it's something you want to think about as your right your own.

所以代码中每条可能的路径,都会有一个返回值分支，这是非常有价值的,当你自己写程序的时候也应该考虑这件事。

麻省理工公开课 - 计算机科学及编程导论课程节选

So the first thing it does, price=0 is it says, if self dot price is 0, I'm just going to return.

所以它做的第一件事就是，如果self。,我就返回。

麻省理工公开课 - 计算机科学及编程导论课程节选

So now let me actually reverse this and go back to the beginning.

所以现在让我们真正倒退,返回到开头。

哈佛公开课 - 计算机科学课程节选