On Tue, Oct 13, 2015 at 8:26 AM, Random832 <[email protected]> wrote: > "R. David Murray" <[email protected]> writes: > >> On 2015年10月13日 14:59:56 +0300, Stefan Mihaila >> <[email protected]> wrote: >>> Maybe it's just python2 habits, but I assume I'm not the only one >>> carelessly thinking that "iterating over an input a second time will >>> result in the same thing as the first time (or raise an error)". >> >> This is the way iterators have always worked. > > It does raise the question though of what working code it would actually > break to have "exhausted" iterators raise an error if you try to iterate > them again rather than silently yield no items.
What about cases where not all of the elements of the iterator are known at the outset? For example, you might have a collection of pending tasks that you periodically loop through and process. Changing the behavior would result in an error when checking for more tasks instead of no tasks. --Chris _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com