The return values of functions are one of those things where Python is ahead of most other languages. Functions are usually allowed to return one object (one value) but, in Python, you can return a tuple, and this implies that you can return whatever you want. This feature allows a coder to write software that would be much harder to write in any other language, or certainly more tedious. We've already said that to return something from a function we need to use the return statement, followed by what we want to return. There can be as many return statements as needed in the body of a function.
On the other hand, if within the body of a function we don't return anything, or we invoke a bare return statement, the function will return None. This behavior is harmless and, even though I don't have the room here to go into detail explaining why Python was designed like this, let me just tell you that this feature allows for several interesting patterns, and confirms Python as a very...