[Python-ideas] Control Flow - Never Executed Loop Body

[Sven R. Kunze]

On 24.03.2016 14:54, Thomas Güttler wrote:
> for item in my_iterator:
>     # do per item
> on empty:
>    # this code gets executed if iterator was empty
> on break:
>    # this code gets executed if the iteration was left by a "break"
> on notempty:
>    # ...
>

Hmm, interesting. "on" would indeed be a distinguishing keyword to 
"except". So, "except" handles exceptions and "on" handles internal 
control flow (the iter protocol). Nice idea actually.

> }}}
>
> Is there a case which I have forgotten?

"on notbreak" I suppose.

I think the downside here is that we would need to register another 
keyword "on". Is this used as a normal variable often?

Not sure if "on empty" can be registered as a single keyword since it 
contains whitespace.

Best,
Sven