PEP 308: "then" "else" for deprecating "and" "or" side effects

Christian Tismer tismer at tismer.com
Sat Feb 15 05:09:25 CET 2003


François Pinard wrote:
> [Christian Tismer]
> 
> 
>>Dear community,
> 
> 
> Nice way to salute! :-)

as it was indented to be :-)

>>there has been some favor of my silly/simple a then b else c proposal.
> 
> 
> Not so long ago, I added a similar feature in an ad hoc language we created
> for one project (French and specialised syntax, and written under pressure).
> Strangely enough, it did not occur to me, before this morning, that there
> was some relation with this long thread in the Python universe. :-)
> 
> If I translate the keywords of our syntax back to English, it gives:
> 
>     a when b else c
> 
> with a chainable property not requiring parentheses:
> 
>     a when b else c when d else ...
> 
> Our language is declarative (tinily functional) rather than imperative.
> Yet, the above writings are not far from the original Guido suggestion.

Well, the difference is of course quite big to me.

a when b else c when d else ...

compared to

a if b else c if d else ...

looks much smoother.

I also could imagine "where":

a where b else c where d else ...

All in favor over re-using a strong "if".
"if" is used to be too much right-orientated...

more-of-this -- chris

-- 
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