[Python-Dev] PEP 479: Change StopIteration handling inside generators (original) (raw)

Chris Angelico rosuav at gmail.com
Fri Nov 21 14:53:41 CET 2014

On Sat, Nov 22, 2014 at 12:47 AM, Raymond Hettinger <raymond.hettinger at gmail.com> wrote:

Also, the proposal breaks a reasonably useful pattern of calling next(subiterator) inside a generator and letting the generator terminate when the data stream ends. Here is an example that I have taught for years:

def izip(iterable1, iterable2): it1 = iter(iterable1) it2 = iter(iterable2) while True: v1 = next(it1) v2 = next(it2) yield v1, v2

Is it obvious to every user that this will consume an element from it1, then silently terminate if it2 no longer has any content?

ChrisA

More information about the Python-Dev mailing list