[Tutor] Two dimensional lists

[Phil]

On 2/11/20 2:46 pm, Cameron Simpson wrote:

Thank you Cameron for your insightful reply.

For the syntax you show above, the direct Python equivalent is a 5
> element list, each element of which is a 5 element list.
>
> So:
>
>      b = [
>            [ 0, 0, 0, 0, 0 ],
>            [ 0, 0, 0, 0, 0 ],
>            [ 0, 0, 0, 0, 0 ],
>            [ 0, 0, 0, 0, 0 ],
>            [ 0, 0, 0, 0, 0 ],
>          ]
>
> The syntax you use "b[3][2]" fetches element 3 (the fourth element,
> since lists count from 0), and then fetches element 2 from _that_. So
> the third element of the fourth list.

That's what I expected as well, however, this is the result;

 >>>
 >>> b = [5],[5]
 >>> b[3][2] = 9
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
 >>> print(b[3][2])
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: tuple index out of range

I'd spent the last 3 or 4 hours experimenting with this but have not 
achieved anything useful. I also had a play with the array module and I 
had another look at numpy and have decided that's the way to go.

Still, I'm a little disappointed that this has defeated me.

-- 

Regards,
Phil