Multi-line lambda proposal.

Sybren Stuvel sybrenUSE at YOURthirdtower.com.imagination
Tue May 9 09:08:59 CEST 2006


Kaz Kylheku enlightened us with:
> I've been reading the recent cross-posted flamewar, and read Guido's
> article where he posits that embedding multi-line lambdas in
> expressions is an unsolvable puzzle.
> [...]
>   a = lambda(x, y), lambda(s, t), lambda(u, w): u + w
>     statement1
>     statement2
>   lambda:
>     statement3
>     statement4

I think it's a very ugly solution. If you need multiple lines in your
lambda, use an inner function. If you need a couple of single-line
lambdas and use them in a multi-line expression, assign them to a name
and use that name in their stead.

>   a = lambda(x, y):
>     return x + y

And what's the advantage of that above this?

    def a(x, y):
        return x + y

> More examples: lambda defined in a function call argument
>
>   a = foo(lambda (x, y)):
>     return x + y
>
> Confusing? Not if you read it properly. "A lambda function is
> constructed with arguments x, y and passed to foo, and the result is
> assigned to a. Oh, and by the way, the body of the
> lambda is: return x + y."

I think it's very, very ugly. Use inner functions for that. They are a
much cleaner solution than this.

Sybren
-- 
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself? 
                                             Frank Zappa



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