Hello

[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)
>    ...
> I tried both the ways... the only thing is its not coming like 0 10 
> 20.......1000 . Its coming like 0,1,2,........1000.....Any answer to the 
> problem.
> 
Each row should be 1 more than the previous row and each column should
be 10 more than the previous column. Just swap your ranges.