Re: [pygame] A question about callback functions

["Mike C. Fletcher" <mcfletch@xxxxxxxxxx>]

mike@xxxxxxxxx wrote:

> > Have a look at this interactive session!
> >
> >    
...

> > >>> myclass = eval(classname)
> > >>> instance = apply(myclass,(3,))
> > >>> instance.show()
> > SecondClass 3
> >    
You may also want to look at the __import__ built-in.

Oh, regarding the original query, a closer mapping of callback functions 
than using OO-style instance methods is to use first-class function objects.

   def callback( x, y, z ):
       """Do something cool"""
   registerCallback( callback )

You can use a first-class function object stored in a variable just as 
you would by referencing it by name.  It's basically a better way of 
doing "function pointers" :) .

Lastly, if you want to be even more flexible, you can use something like 
PyDispatcher and send events from your objects which the client's code 
can observe.  That allows for multiple levels of customisation all 
registering for the same callback "event", for instance. 

Have fun,
Mike

--
________________________________________________
 Mike C. Fletcher
 Designer, VR Plumber, Coder
 http://www.vrplumber.com
 http://blog.vrplumber.com