Why won't this decorator work?

[Gregory Ewing]

Ian Kelly wrote:
> If it's not a callable, then the result
> will just be that something non-callable is bound to the "roll_die"
> name -- which could be useful, but is probably a bad idea in general.

There are legitimate uses -- for example, the following
is a convenient way of creating a read-only property:

   @property
   def foo(self):
     return self.calculate_value_of_foo()

-- 
Greg