[Tutor] insering into lists through slices

[Pujo Aji]

when you operate slice be carefull of the position of pointer which
slice the list:

L = [    0  , 1 , 2 , 3]
        ^     ^
 pos 0     1

That's why :
  L = [1,2,3]
  L[0:1] = [7]
  print L  # will replace element 1

  L = [1,2,3]
  L[1:1] = [7]
  print L # will insert 7 between element 1 and 2


pujo



On 6/3/05, venkata subramanian <venkatasubramanian at gmail.com> wrote:
> Hi,
>   I am a newbie to Python (that's very guessable).
>   I simply fail to understand the semantics of the following piece of code.
>   #assuming ls=[1,2,3,4]
>   >>>ls[1:1]=[5,6]
>  #then ls becomes
>  >>> ls
> [1, 5, 6, 2, 3, 4]
> 
>  i would be happy to know how it works.
> 
>  Basically, ls[1:1] returns an empty list and assigning [5,6] to it,
> actually inserts the elements... but how?
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