Add methods to a class at runtime?

[holger krekel]

Chris Liechti wrote:
> "Robert Oschler" <Oschler at earthlink.net> wrote in
> news:wmvc9.21757$FJ1.3181934 at e3500-atl1.usenetserver.com: 
> > Some interesting tidbits I
> > found while trying out your suggestions,  as you will see in the two
> > ".py" files that follow, I discovered that to create a method you can
> > dynamically add to a class _instance_, you need to omit the 'self'
> > parameter in the method declaration.  For a method you add dynamically
> > to a class definition itself, then you must include the 'self' 
> > parameter in the method declaration.  If not, you will get an argument
> > count mismatch complaint from the interpreter.  Fascinating stuff.
> 
> that's just the differece between a "function" and a "method". a method 
> works on an object and that is passed explicit as first argument. "explicit 
> is better than implicit" (you can read this and some other design ideas by 
> typing ">>> import this" ;-)
> 
> > I'm running 2.1.1, anybody know if 2.2.2 is going "disable" either of
> > these abilities? (class or class instance dynamic method addition).  I
> > saw a note about such activities requiring a "dynamic" keyword, which
> > is fine.  I'd really miss either of these abilities.
> 
> nah. "classic classes" stay the way they are and are available until 3.0
> new style classes, those that inherit from "object" or "type", will need 
> the marking as "dynamic".

Can you give a pointer for further explanation?  Can't believe it :-)

thanks,

    holger