上代码.

class Event(list):
    def __call__(self, *args, **kwargs):
        for f in self:
            f(*args, **kwargs)

def f(arg): print 'execute with arg',arg

e = Event()
e.append(f)
e('kzc')#触发事件
e.remove(f)

飘逸的python - 一个极简的event系统