array alice of [:-0] ??

[John Machin]

On 18/07/2006 11:17 PM, guthrie wrote:
> Beginner question! :-)
> 
> x=[1,2,3,4]
> for i in range(len(x)):
>    print x[:-i]
> 
>  >>> []
>  >>> [1,2,3]
>  >>> [1,2]
>  >>> [1]
> 
> 1) The x[:-0] result seems inconsistent to me;
>     I get the idea that -0=0, so it is taken as x[:0] -> []
> 2) how then should one do this basic left-recursive subsetting (easily).
> 
>

|>> for i in range(len(x), -1, -1):
...     print x[:i]
...
[1, 2, 3, 4]
[1, 2, 3]
[1, 2]
[1]
[]