Should a Python generator raise an exception when there are no more elements to yield?
Which one?
views:
71answers:
2
+7
A:
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.
Mark Byers
2010-02-23 22:49:45
This answers my vague question, but I was wondering to know if in my code I should manually raise it.
Juanjo Conti
2010-02-23 23:18:36
+3
A:
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.
Shane Holloway
2010-02-23 22:53:51