decorator with closure

gistfile1.py

def will_break(f):
    broken = False
    def on_call(self, *args, **kwargs):
        if broken:
            raise ValueError("Already broken!")
        else:
            broken = True
            f(self, *args, **kwargs)

    return on_call

class AnEgg(object):

    @will_break
    def __call__(self):
        print("I am a tasty egggg.")

egg = AnEgg()
egg()
egg() # should throw a ValueError

(same behaviour in 2.7 and 3.3)

Fixed with this:

def will_break(f):
    def on_call(self, *args, **kwargs):
        if on_call.broken:
            raise ValueError("Already broken!")
        else:
            on_call.broken = True
            f(self, *args, **kwargs)

    on_call.broken = False
    return on_call

class AnEgg(object):
    def __init__(self):
        self.num = 1

    @will_break
    def __call__(self):
        print("I am a tasty egggg.")
        print(str(self.num))

egg = AnEgg()
egg()
egg()