From: Chad Perrin <perrin@...>
Date: 2006-07-27T08:33:31+09:00
Subject: Re: For performance, write it in C

On Thu, Jul 27, 2006 at 08:25:11AM +0900, Csaba Henk wrote:
> On 2006-07-26, Sean O'Halpin <sean.ohalpin@gmail.com> wrote:
> > implemented. For example, Ruby has real closures, Python doesn't. I
> 
> Even if OT, just for the sake of correctness: let me remark that Python
> does have closures. Local functions (ones defined within another
> function's body) are scoped lexically.
> 
> It's just sort of an anti-POLA (and inconvenient, as-is) piece of
> semantics that variables get reinitalized upon assignment.
> 
> Hence:
> 
> def foo():
>     x = 5
>     def bar():
>         x = 6
>         return x
>     bar()
>     return x, bar
> 
> x, bar = foo()
> print x, bar() ==> 5 6
> 
> def foo():
>     _x = [5]
>     def bar():
>         _x[0] = 6
>         return _x[0]
>     bar()
>     return _x[0], bar
> 
> x, bar = foo()
> print x, bar()  ==> 6 6
> 

Is it just me, or are there no proper closures in that example code?

-- 
CCD CopyWrite Chad Perrin [ http://ccd.apotheon.org ]
print substr("Just another Perl hacker", 0, -2);