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

[Alexey Muranov]

On Thu, 2017-11-02 at 08:21 +1100, Chris Angelico wrote:
> >
> >
> With try/except/else, it's "do this, and if an exception happens, do 
> this, else do this". So else makes perfect sense.

Indeed, i forgot about `except`.  I agree that 
"try/then/except/finally" would be better than 
"try/except/then/finally", but "try/except/else/finally" does not make 
a perfect sense IMHO.

Alexey.