replacing `else` with `then` in `for` and `try`

[Michael Torrie]

On 11/03/2017 09:06 PM, Chris Angelico wrote:
> On Sat, Nov 4, 2017 at 1:57 PM, Michael Torrie <torriem at gmail.com> wrote:
>> On 11/03/2017 07:09 PM, Steve D'Aprano wrote:
>>> On Sat, 4 Nov 2017 06:15 am, Michael Torrie wrote:
>>>
>>>> In fact if you have no break you may as well drop the
>>>> else entirely, because the block will always execute.
>>>
>>> That's incorrect. There are multiple ways to exit a loop that will prevent the
>>> `else` block from executing, `break` is only one.
>>
>> Such as?
> 
> There are many. But other than break, I don't know of any that WOULD
> execute the next line of code immediately _after_ the loop.

Can you be more specific? What are some of these "many" ways of aborting
a loop?  Help a guy out here.

I know, for example, that we have exceptions. But those hardly matter in
this discussion because they wouldn't execute the else clause either.
They'd either be caught elsewhere, or end the program.  sys.exit() can
also terminate a for loop, but it terminates the whole program without
running the else statement.