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

Ian Bicking ianb at colorstudy.com
Fri Feb 7 22:16:25 CET 2003


On Fri, 2003-02-07 at 13:47, holger krekel wrote:
>     result = obj() if callable(obj)
> 
> should indeed set the result to None if the condition evalutes
> to false.  I don't think there is any other sensible result 
> other than 'None'.  But of course, 
> 
>     result = obj() if callable(obj) else None
> 
> would be more explicit.  The question is whether my suggestion
> has enough use cases and is thus practical enough.  

To me (obj() if callable(obj)) makes sense without the else.  It's like
a function that implicitly returns None, or the .get() method on
dictionaries (without the second argument).  Though admittedly I did not
recognize this behavior when I first learned Python, and it was only
later that I started depending on None being returned implicitly.

-- 
Ian Bicking  ianb at colorstudy.com  http://colorstudy.com
4869 N. Talman Ave., Chicago, IL 60625  /  773-275-7241
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 killing innocent people" -- Howard Zinn





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