[Tutor] Inheritance : what am I doing wrong?

[alan.gauld@bt.com]

> I'm having a problem with inheritance. 

I don't think so :-)

>     class ball(visual.sphere):
>         def __init__(self):
>             visual.sphere.__init__(self, radius = 0.5)

You shouldn't be able to do that. 
You must set radius outside the call to the function.

		radius = 0.5
		visual.sphere.__init__(self, radius)

>             self.velocity = visual.vector(0, 0, 0)

> And I get the following error message:
>     TypeError: __init__() takes exactly 2 arguments (4 given)

This seems to match the visual vector call - have you checked 
the parameters of that constructor?

I don't think its anything to do with inheritance per se but 
just how you are calling the functions.

Alan g.
Author of the 'Learning to Program' web site
http://www.freenetpages.co.uk/hp/alan.gauld