[Python-ideas] Syntax for passing lambdas to functions

[Nick Coghlan]

On 27 Feb 2014 17:33, "Greg Ewing" <greg.ewing at canterbury.ac.nz> wrote:
>
> Chris Angelico wrote:
>>
>> It's
>> problematic because it's still legal - if it threw a SyntaxError, it
>> would at least be visible, but it doesn't:
>>
>>     spam=fire_the_ducks(42)
>>     f(onclick()=spam)
>
>
> That's equivalent to
>
>    spam = fire_the_ducks(42)
>    f(onclick = lambda: spam)
>
> which is not a syntax error either, but it's just as wrong,
> and I'm not convinced that it's a harder mistake to make.
>
> For what it's worth, the following *could* be made to work:
>
>    spam() = fire_the_ducks(42)
>    f(onclick = spam)

Let's talk about that for a moment. It would be a matter of making this:

    NAME(ARGSPEC) = EXPR

syntactic sugar for this:

    def NAME(ARGSPEC): return EXPR

Not what you would call a big win.

Cheers,
Nick.

>
> --
> Greg
>
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