For review: PEP 308 - If-then-else expression

[Ian Sparks]

>>
iff(<condition>, <trueresult>, falseresult) which returns <trueresult> if <condition> is true,
otherwise returns <falseresult
<<

MSAccess Basic had this exact construct which they called an "Inline IF".

Only difference is that it was "iif" instead of "iff"

- Ian Sparks.


-----Original Message-----
From: Harvey Thomas [mailto:hst at empolis.co.uk]
Sent: Friday, February 07, 2003 2:05 PM
To: Jack Diederich; python-list at python.org
Subject: RE: For review: PEP 308 - If-then-else expression


Jack Diederich wrote:

> Sent: 07 February 2003 18:18
> To: python-list at python.org
> Subject: Re: For review: PEP 308 - If-then-else expression
> 
> 
> On Fri, Feb 07, 2003 at 06:46:55PM +0100, holger krekel wrote:
> > What about a missing else clause? e.g. 
> > 
> >         <expression> if <condition>
> 
> if (<condition>): <expression>
> 
> is already legal so I'm -1 for yet another way to do it
> 
> > Allowing it could be nice for stuff like 
> >     result = obj(...) if callable(obj)
> 
> -1 as above
> 
> > Note though, that this proposal obfuscates control "flow"  
> > (which guido already knows, of course).  You can't read it 
> > neither from "left to right" nor from "right to left".  
> 
> a good reason for -1, another would be that perl has both
> ways of doing it ;)
> 
Agree with your comments.

What about a built-in function?

iff(<condition>, <trueresult>, falseresult) which returns <trueresult> if <condition> is true,
otherwise returns <falseresult

The flow is left to right (more or less), it's similar to constructs in other languages.

It can of course be written in Python currently in a rather horrible way.

Harvey

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