[Python-Dev] nightmare: PEP 252, PEP 253 and jython issues

[Guido van Rossum]

[snip]
[SP]
> *bad-guy-java*
> > > > > Yes ... very slow and we would have to use that also at the very
> > > > > core of the hierarchy, see (*) but the problem is more
> > > > > complicated, in Java given three classes
> > > > > 
> > > > > C extends B extends A
> > > > > and a method m
> > > > > C.m overrides B.m overrides A.m
> > > > > 
> > > > > there is not direct way (even using reflection) 
> > > > > to apply B.m behaviour to a C object, unless
> > > > > the programmer has left some hook in C using super
> > > > > or in B ( a method B_m e.g.).
> 
[snip]
> I overlooked a central point, namely *bad-guy-java*
> 
> I fear, because of it, we have to code all the built-in types this way,
> 
> 
> class SpamType {
> 
> ... SpamTypes__foo__ { ...
> }
> 
> ... __foo__ { }
> 
> }
> 
> Or find other slower ways, otherwise no descrs for them 

As long as the slowness only applies when someone invokes
SpamType.__foo__(x), that's acceptable.

--Guido van Rossum (home page: http://www.python.org/~guido/)