# Need help in understanding a python code

Meryl Silverburgh silverburgh.meryl at gmail.com
Sun Nov 16 06:15:23 CET 2008

```This is the full source code:
def A(w, v, i,j):
if i == 0 or j == 0: return 0
if w[i-1] > j:  return A(w, v, i-1, j)
if w[i-1] <= j: return max(A(w,v, i-1, j), v[i-1] + A(w,v, i-1, j - w[i-1]))

http://20bits.com/articles/introduction-to-dynamic-programming/

On Sat, Nov 15, 2008 at 10:54 PM, Chris Rebert <clp at rebertia.com> wrote:
> On Sat, Nov 15, 2008 at 8:41 PM, silverburgh.meryl at gmail.com
> <silverburgh.meryl at gmail.com> wrote:
>> Hi,
>>
>> I am trying to understand the following line:
>> # a is an integer array
>>
>> max([(sum(a[j:i]), (j,i))
>
> This code isn't valid. You have a [ with no closing ].
>
> Cheers,
> Chris
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
>>
>> Can you please tell me what that means,
>> I think sum(a[j:i] means find the some from a[j] to a[i]
>> But what is the meaning of the part (j,i)?
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>

```