gistfile1.py

class Manager(object):
    def __init__(self):
        self.funcs = {}

    def regTrigger(self, func, trig):
        trig = trig.lower()
        if not trig in self.funcs:
            self.funcs[trig] = []

        self.funcs[trig].append(func)

    def call(self, trig, *args):
        trig = trig.lower()
        if not trig in self.funcs:
            return False

        for func in self.funcs[trig]:
            func(*args)

class PlugBase(object):
    funcs = {}

    @classmethod
    def trigger(cls, *triggers):
        def call(func):
            for trig in triggers:
                if not trig in cls.funcs:
                    cls.funcs[trig] = []

                cls.funcs[trig].append(func.__name__)

            return func
        return call

    def init(self, manager):
        for trig, funcs in self.funcs.iteritems():
            for func in funcs:
                manager.regTrigger(getattr(self, func), trig)
                self.funcs[trig].remove(func)

class Plug(PlugBase):
    @PlugBase.trigger("msg")
    def on_msg(self, msg):
        print msg

m = Manager()
p = Plug()
p.init(m)
m.call("msg", "ohai")