[Tutor] summing lists

[James Reynolds]

On Tue, Apr 10, 2012 at 11:22 AM, Hs Hs <ilhs_hs at yahoo.com> wrote:

> Hi:
>
> I have 4 lists:
>
> >>> a
> [40]
> >>> b
> [2]
> >>> c
> [23]
> >>> d
> [12]
>
>
> how is it possible to do add elements in list. I can do this using
> tupples, but I do not know how to append elements to tuple, thats the
> reason I am using list.
>
> I want to find the value of a+c/a+b+c+d - which is 40+23/40+2+23+12.
>
> Any help appreciated.
>
> thanks
> Hs.
>
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In python, the '+' operator when applied to lists will concatenate the
lists together. So:

>>> a = [1]
>>> b = [2]
>>> print a+b
[1,2]

the 'sum' function in python can be used on lists.

>>> a = [1]
>>> b = [2]
>>> print sum(a+b)
3
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