Python-list Digest, Vol 70, Issue 123

[MRAB]

Tanmoy wrote:
> Hello ,
>           When i==0 you append an empty list to arr, so arr[i] is arr[0]. No
> problem.
> 
> When i==10 you append another empty list to arr, so arr[i] is arr[10].
> Index error because there's no arr[10], only arr[0] and arr[1].
>  
> 
> Thanks for your prompt reply...
> 
> How can i pass this problem
> 
You could try appending to arr[-1] instead.

Better still:

     ...
     row = []
     for j in range(0,1001,1):
           row.append(i+j)
     arr.append(row)
     ...