On Nov 20, 12:32 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > On Nov 20, 2:05 am, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote: > > > > > On Mon, 19 Nov 2007 20:59:51 -0800, [EMAIL PROTECTED] wrote: > > > How do I add a decorator to a class method? Here's what I want to do, > > > but I guess my syntax isn't right. Any advice? > > > > class A: > > > def pre(self,fn): > > > def new_func(*args,**kwargs): > > > print 'hi' > > > fn(*args,**kwargs) > > > return new_func > > > @self.pre > > > At this point there is no `self` which is exactly what the exception says > > if you run this. This method definition executed at class definition time > > so there is no instance of `A`. You can't change it to [EMAIL PROTECTED] > > either > > because the class is not fully constructed yet so the class name `A` does > > not exist yet. So you have to move `pre()` out of the class. > > > def pre(fn): > > def new_func(*args, **kwargs): > > print "'hi'" > > fn(*args, **kwargs) > > return new_func > > > class A(object): > > @pre > > def func(self, a, b): > > print a + b > > > a = A() > > a.func(3, 5) > > > Ciao, > > Marc 'BlackJack' Rintsch > > Thanks those answers make sense. But for this function if defined > outside the class: > > > def pre(fn): > > def new_func(*args, **kwargs): > > print "'hi'" > > fn(*args, **kwargs) > > return new_func > > Can new_func reference self? Would self just be one of the args? > > -Greg
For methods, self is always "just one of the args". When the decorator is applied to a method, self will be args[0] in new_func. --Nathan Davis -- http://mail.python.org/mailman/listinfo/python-list
