[Reality] in ambulation.Room where is IWalkTarget?

[Donovan Preston]

On Friday, July 4, 2003, at 9:47PM, Lee Harr wrote:

> I am trying to figure out where IWalkTarget comes from in
> reality.ambulation
>
> I find that after the definition
>
> class Walk(actions.TargetAction, things.MovementEvent):
>
> the names IWalkTarget and IWalkActor are defined, but
> I do not see how that is done. Any hints?

Magic :-)

I'm not entirely sure, but I think it has something to do with the 
metaclass of either TargetAction or MovementEvent. Somewhere, a 
metaclass magically creates a bunch of interface classes when you 
subclass, so that you don't have to define them all by hand. Saves a 
tremendous amount of typing, but can be confusing if you are trying to 
read the code.

dp