Clean Python getters and setters

From Diez Roggish answering a question from Daniel Fetchinson at the end of November:

class Foo(object):

   @apply
   def x( ):
      def fget(self):
         return self.__x
      def fset(self, value):
         self.__x = value
      return property(**locals( ))

Clean getters and setters ... with decorator magic. The original thread is here.