On Fri, Jun 1, 2018 at 4:56 PM Gregory Ewing <greg.ew...@canterbury.ac.nz> wrote:
> Chris Angelico wrote: > > It is an error to mutate the dictionary *and then continue to iterate > over it*. > > But if you're processing the last key, and you add one so > that it's no longer the last key, what should happen? > > My feeling is that this should be an error, because it's > not clear whether iteration should stop at that point > or not. > > -- > Greg > -- > https://mail.python.org/mailman/listinfo/python-list > Regardless how CPython works, it's prohibited, and behavior is **undefined**. There are no "what should happen". Python interpreters may or may not raise error. And any error (RuntimeError, MemoryError, interpreter freeze) may happen. Python programmer shouldn't rely on the behavior. Regards, -- INADA Naoki <songofaca...@gmail.com> -- https://mail.python.org/mailman/listinfo/python-list
