BartC <b...@freeuk.com> writes: > On 28/03/2016 01:54, Steven D'Aprano wrote: <snip> >> What should be the return value of this statement? >> >> while True: >> x += 1 >> if condition: break > > Many statements such as loops just returned 'void' in A68. The > interesting statements were if, case-switch and block (where the value > is that of the last statement/expression).
An alternative would be for a loop to return the last value of its controlling expression. This is usually false for a whole loop but would be true is the loop was exited using break. In a for loop, the value would be the last value of its control variable. This would again permit you to tell a break from a normal for loop finishing. This way you can make the loop variable local and still use its final value outside the loop. Both would render some flag variables and some auxiliary variables redundant though I've not seen a language that does it. Maybe in practice it does not work out so well, but it looked useful when I sketch it out a while back. <snip> -- Ben. -- https://mail.python.org/mailman/listinfo/python-list
