[Tutor] Use of "or" in a lambda expression

[Alan Gauld]

On 05/04/15 04:45, boB Stepp wrote:

>>>> He could have done it in various other ways too:
>>>>
>>>> eg.
>>>> lambda : all(print('Hello lambda world!'), sys.exit() )

> Well, now I am curious as to why the "all" form evaluates BOTH
> elements. Apparently it does not apply the short-circuit logic we have
> been discussing, or it would stop evaluating after the print statement
> return.  Why is that?

Because I didn't really think the example through properly.
I just grabbed the first thing I could think of that would
evaluate both functions... As Cameron has shown, a much more
elegant solution is just to use a tuple as the body of
the lambda.

That's effectively what's happening indside the all()/any()
calls.


-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos