Multi-dimensional list initialization

Prasad, Ramit ramit.prasad at jpmorgan.com
Fri Nov 9 21:31:47 CET 2012


Dennis Lee Bieber wrote:
> 
> On Fri, 9 Nov 2012 17:07:09 +1100, Chris Angelico <rosuav at gmail.com>
> declaimed the following in gmane.comp.python.general:
> 
> > On Fri, Nov 9, 2012 at 12:39 PM, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:
> > > On 07/11/2012 01:55, Steven D'Aprano wrote:
> > >>
> > >>
> > >> Who knows? Who cares? Nobody does:
> > >>
> > >> n -= n
> > >>
> > >
> > > But I've seen this scattered through code:
> > >
> > > x := x - x - x
> >
> > Can you enlighten us as to how this is better than either:
> >  x := -x
> > or
> >  x := 0 - x
> 
> 	Of course, if one has a language that, for some reason, evaluates
> right-to-left (APL, anyone), then
> 
> 	x := x - x - x
> 
> becomes
> 
> 	x := x - 0
> 

Is that not the same as x:=-x?


~Ramit


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