[Python-Dev] metaclass insanity
Guido van Rossum
Tue, 05 Nov 2002 10:03:51 -0500
> > Can someone provide a reason why you'd want to use nested classes?
> > I've never felt this need myself. What are the motivations?
> XIST (http://www.livinglogic.de/Python/xist/) uses nested classes
> to map XML element types and their attributes to Python classes.
> For example the HTML element type img looks like this in XIST:
> class img(Element):
> class Attrs(Element.Attrs):
> class src(URLAttr): required = True
> class alt(TextAttr): required = True
> class align(TextAttr): values = ("top", "middle", ...)
--Guido van Rossum (home page: http://www.python.org/~guido/)