File: abstractmodel.py

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class AbstractModel(object):

    def __init__(self):
        self.listeners = []

    def addListener(self, listenerFunc):
        self.listeners.append(listenerFunc)

    def removeListener(self, listenerFunc):
        self.listeners.remove(listenerFunc)

    def update(self):
        for eachFunc in self.listeners:
            eachFunc(self)