[Python-3000] Metaclass Vs Class Decorator (original) (raw)

paul bedaride paul.bedaride at gmail.com
Mon May 19 19:34:17 CEST 2008

I think about it, and I think that it's two differents way of applying a similar thing,

it's why I wonder, if this can't be good if metaclass and class decorator have the same interface, then we can use a class as a metaclass or as a decorator ??

paul bedaride

On Mon, May 19, 2008 at 6:10 PM, Guido van Rossum <guido at python.org> wrote:

On Sun, May 18, 2008 at 8:36 PM, Raymond Hettinger <python at rcn.com> wrote: >>> It's why a want to know how to express the class decorator for making a >>> comparison > > [Georg] >> >> A class decorator works exactly like a function decorator, that is, >> >> @foo >> class X: ... >> >> is equivalent to >> >> class X: ... >> X = foo(X) >> >> This should be all you need to know in order to write a class decorator. > > I concur.

Technically, that's true, but an example wouldn't hurt. Examples also help understanding the motivation. Even the difference between class decorators and metaclasses could be explained with examples. (E.g. a metaclass that auto-registers its classes vs. a class decorator that registers a class.) -- --Guido van Rossum (home page: http://www.python.org/~guido/<http://www.python.org/%7Eguido/> )

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