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class FirstClass:    myclass = {}        def __init__(self, ClassList):        print "FirstClass: I'm alive!"        self.updateClassList(ClassList)    def updateClassList(self, ClassList):        self.myclass = ClassList        print "FirstClass: classlist updated"    def hello(self):        print "FirstClass: Someone said hello!"    def callSecondClass(self):        print "FirstClass: Saying hi to SecondClass..."        self.myclass['SecondClass'].hello()class SecondClass:    myclass = {}        def __init__(self, ClassList):        print "SecondClass: I'm alive!"        self.updateClassList(ClassList)    def updateClassList(self, ClassList):        self.myclass = ClassList        print "FirstClass: classlist updated"    def hello(self):        print "SecondClass: Someone said hello!"    def callFirstClass(self):        print "SecondClass: Saying hi to FirstClass..."        self.myclass['FirstClass'].hello()'''Main here'''ClassList = {'FirstClass':None, 'SecondClass':None}ClassList['FirstClass'] = FirstClass(ClassList)ClassList['SecondClass'] = SecondClass(ClassList)for cl in ClassList:    ClassList[cl].updateClassList(ClassList)ClassList['FirstClass'].callSecondClass()ClassList['SecondClass'].callFirstClass()