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class Publisher(object):
def __init__(self):
self.subscribers = []
def subscribe(self, who):
if who not in self.subscribers:
self.subscribers.append(who)
def unsubscribe(self, who):
if who in self.subscribers:
self.subscribers.remove(who)
def publish(self, message, *args):
for subscriber in self.subscribers:
method = "msg_" + message
if hasattr(subscriber, method):
getattr(subscriber, method)(*args)
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