[Python-Dev] PEP 463: Exception-catching expressions

[Eric Snow]

On Fri, Feb 21, 2014 at 6:06 PM, Jan Kaliszewski <zuo at chopin.edu.pl> wrote:
> 21.02.2014 18:37, Guido van Rossum wrote:
>
>> I'm put off by the ':' syntax myself (it looks to me as if someone
>> forgot a newline somewhere)
>
>
> As I mentioned at python-ideas I believe that parens neutralize,
> at least to some extent, that unfortunate statement-ish flavor
> of the colon.
>
> This one has some statement-like smell:
>
>     msg = seq[i] except IndexError: "nothing"
>
> But this looks better, I believe:
>
>     msg = (seq[i] except IndexError: "nothing")

Agreed.  The same holds true with {'a': 5} and function annotations
(e.g. "def f(a: 5)").

> Or even (still being my favorite):
>
>     msg = seq[i] except (IndexError: "nothing")

+1

-eric