You could use __getattr__
:
class foo(object):
def f1(self):
print "original f1"
def f2(self):
print "original f2"
class foo_decorator(object):
def __init__(self, decoratee):
self._decoratee = decoratee
def f1(self):
print "decorated f1"
self._decoratee.f1()
def __getattr__(self, name):
return getattr(self._decoratee, name)
u = foo()
v = foo_decorator(u)
v.f1()
v.f2()