On Tue, Feb 10, 2015 at 11:42 AM, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote: > Also, *technically* iterators may be re-iterable. The docs say that > iterators which fail to raise StopIteration forever once they are exhausted > are "broken", but the docs do not forbid broken iterators. Consenting > adults and all that. You might want an iterator with a reset() method. Even > an outright broken iterator! > > def __next__(self): > if random.random() < 0.1: raise StopIteration > return random.random() > > Why you would want one, I don't know, but if you have a hankering for such a > beast, Python lets you do it.
Yes, it is allowed. But when you write code that's documented as being "broken", you should expect annoying, subtle errors, maybe a long way down the track. You know all those niggling problems you get when you find some NaNs in a series of numbers, and suddenly things don't sort stably and such? You'll hanker for those well-defined days. :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
