@makebold
@makeitalic
def say():
   return "Hello"

<b><i>Hello</i></b>

def makebold(fn):
    def pacote():
        return "<b>" + fn() + "</b>"
    return pacote

def makeitalic(fn):
    def pacote():
        return "<i>" + fn() + "</i>"
    return pacote

@makebold
@makeitalic
def hello():
    return "Olá Mundo"

print hello() ## retorno <b><i>Olá Mundo</i></b>