[Tutor] Adding Lists?

[bob gailer]

Alan Gauld wrote:
>
> "Emile van Sebille" <emile at fenx.com> wrote
>
>>> yet if i wrote range (1, 500, 2) [1, 3, 5, 7....... ..499] is there 
>>> a command where i could total that list quickly?
>>>
>>
>> You're looking for sum --
>>  sum(range (1, 500, 2) )
>
> Or on older Python versions reduce:
>
> import operator
> s = reduce(operator.add, range(1,500,2))

This is good to know about, as:

(1) the operator module has methods for all native operators
     e.g., s = reduce(operator.mul, range(1,500,2)) to get the product.

(2) one may use any function as the first argument to reduce
    e.g., reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])
    calculates ((((1+2)+3)+4)+5) (the sum)


-- 
Bob Gailer
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