[Tutor] mysterious object

[Alan Gauld]

> def adder(**args):
>    for x in args.keys():
>        print x

A function which doesn't return a value returns None by default.

> print adder()

You are asking Python to print the return value of the function,
which is None.

As a general rule its better to do the printing outside of the function and
just do the calculation bit inside, this makes the function much easier to
reuse in future.

HTH

Alan G
Author of the learn to program web tutor
http://www.freenetpages.co.uk/hp/alan.gauld