[Tutor] cross sum toying

[Gregor Lingl]

Lloyd Kvam schrieb:

> Not sure why you're unhappy with version 4.  It can be split into a
> digit generator and a summer:
>
> >>> def digit_generator(a,base=10):
> ...     a = abs(a)
> ...     while a:
> ...         a,d = divmod(a,base)
> ...         yield d
>
> (import operator)
> >>> def cross_sum(a):
> ...     return reduce(operator.add,digit_generator(a),0)

Very interesting, very nice!

When working with Python 2.3, I can use the now built in  sum:

def cross_sum5(a):
    return sum([digit for digit in digit_generator(a)])

Thanks for the idea!
I've added this to my collection.
BTW, I was not really unhappy but interested in different
ways to handle this problem.

Maybe the cross sum zoo will continue growing ...
... although there should be one -- and preferably only one --
obvious way to do it? ;-)

Regards, Gregor