[Python-ideas] except expression

[Steven D'Aprano]

On Wed, Feb 19, 2014 at 10:17:05PM +1000, Nick Coghlan wrote:

> That said, I did suggest using the function return type annotation
> marker as a possibility, and that's not currently listed in the PEP:
> 
>     value = lst[2] except IndexError -> 'No value'

I missed that too. I prefer that to nearly all of the keyword based 
suggestions so far. In order of most preferred to least:

+1   :
+0.9 ->
+0.5 then
-0.5 return
-1   pass, else


-> also passes the Tim Peters "grit on monitor" test. 


> I do slightly prefer that to the colon based version, although we may
> want to go with the generator expression approach of always requiring
> parentheses around it (with function call parentheses counting):
> 
>     value = (lst[2] except IndexError -> 'No value')

I'd be happy with that solution.



-- 
Steven