gistfile1.py

import sys

class Decor(object):
    def __init__(self, f, c):
        print "Decor.__init__"
        self._f = f
        self._c = c

    def __call__(self):
        print "Decor.__call__"
        print self._f, self._c
        self._f()

class B(object):
    def __init__(self):
        print "B.__init__"
        print self.__class__

        self.func = Decor(self._func, self.__class__)

    def _func(self):
        print "B._func"

print "Creating .."
b = B()
print
print "Calling .."
b.func()