python - Does a StopIteration exception automatically propagate upward through my iterator? -

i'm implementing iterator in python wraps around iterator , post-processes iterator's output before passing on. here's trivial example takes iterator returns strings , prepends filtered myiter: each one:

class myiter(object):     """a filter iterator returns strings."""     def __init__(self, string_iterator):         self.inner_iterator = string_iterator     def __iter__(self):         return self     def next(self):         return "filtered myiter: " + self.inner_iterator.next() 

when inner iterator finishes, raise stopiteration exception. need special propagate exception wo whatever code using my iterator? or happen automatically, resulting in correct termination of iterator.

you not have special - stopiteration exception propageted automatically.

in addition - may want read yield keyword - simplifies creation of generators/iterators lot.