little problem with list.reverse() function

Roy Smith roy at panix.com
Sat Sep 11 18:06:03 CEST 2004


In article <LRE0d.236333$OR2.10714605 at news3.tin.it>,
 manuel <manuelbastioniNOSPAM at tin.it> wrote:

>  >>> a = [[1,2],[2,3],[4,5]]
>  >>> print a
> [[1, 2], [2, 3], [4, 5]]
>  >>> print a.reverse()
> None
>  >>>
> 
> 
> 
> ???
> Thanks...

The reverse() method of lists reverses the list in-place, and returns 
None on purpose.  Almost everybody finds this surprising when they 
discover it for the first time.  Many people (myself included) consider 
it a design flaw.  But, it is an intentional design decision, not a bug.



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