generators as decorators simple issue

[Thomas Rachel]

Am 12.09.2012 04:28 schrieb j.m.dagenhart at gmail.com:
> I'm trying to call SetName on an object to prevent me from ever having to call it explictly again on that object. Best explained by example.
>
>
> def setname(cls):
>      '''this is the proposed generator to call SetName on the object'''
>      try:
>          cls.SetName(cls.__name__)
>      finally:
>          yield cls
>
>
> class Trial:
>      '''class to demonstrate with'''
>      def SetName(self, name):
>          print 1, 1
>
> @setname
> class Test(Trial):
>      '''i want SetName to be called by using setname as a decorator'''
>      def __init__(self):
>
>          print 'Yay! or Invalid.'
>
> if __name__ == '__main__':
>      test = Test()
>
>
> How can i fix this?

I am not sure what exactly you want to achieve, but I see 2 problems here:

1. Your setname operates on a class, but your SetName() is an instance 
function.

2. I don't really understand the try...finally yield stuff. As others 
already said, you probably just want to return. I don't see what a 
generator would be useful for here...

def setname(cls):
      '''this is the proposed generator to call SetName on the object'''
      try:
          cls.SetName(cls.__name__)
      finally:
          return cls

and

class Trial(object):
     '''class to demonstrate with'''
     @classmethod
     def SetName(cls, name):
         print 1, 1

should solve your problems.