Re: [Visualpython-users] Visual Python Help

[Ron A. <rr...@ro...>]

bre...@un... wrote:
> 
> Interesting and a nice "refactoring".

Thanks :-)

> I just started with vPython (but already know Python somewhat) and 
> assumed that to create groups one would derive classes from frame, as 
> shown.  It seems to work, but is this not preferred/robust?
>
> import visual as v
> 
> class Wheelset(*v.frame*):
> 
>     def __init__(self, xPos, whlRad=0.5, /etc/):
> 
>         *v.frame.__init__(self,* pos=(xPos,whlRad,0.0)*)*
>        
>         v.cylinder(*frame=self*, pos=(0,0,-0.5*axleLength),
>                    axis=(0.0, 0.0, axleLength), radius=axlRad)
>        etc

When I tried a variation of the above with the Head() object, the class 
color attribute was overwritten.  The defaults could be moved to within the 
__init__ method, but then you may have the opposite problem of overwriting 
a frame attribute or method without knowing it.  So I think if there are a 
lot of methods or attributes, using a container obj makes it easier to 
avoid name clashes.  But it looks like, either way is ok.

Ron