Should a Python generator raise an exception when there are no more elements to yield?

Question

Should a Python generator raise an exception when there are no more elements to yield?

Which one?

Answer 1

The only time I know that you have to manually raise StopIteration is when you are implementing a next() method on a class to signal that the iterator is terminated. For generators (functions with yield statements in them), the end of the function or a return statement will properly trigger the StopIteration for you.