当没有更多元素可以产生时，Python生成器是否应该引发异常？

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.

Answer 2

It doesn't have to, but it can raise a StopIteration .

The more normal way to end the iteration is to let the function end and return naturally, or to use a return statement. This will cause a StopIteration to be raised on your behalf.