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def message_compare(m1, m2) :
return cmp(m1.date, m2.date)
class Message :
def __init__(self, date, user, text) :
self.date = date
self.user = user
self.text = text
class Backend :
def __init__(self) :
self.handlers = []
def addMessageHandler(self, handler) :
self.handlers.append(handler)
def notifyMessage(self, message) :
for handler in self.handlers :
handler(message)
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