class Mediator(object):    def sendmsg(self,msg,person):        passclass Person(object):    def __init__(self,name,mediator):        self._name = name        self._mediator = mediator    def contact(self,msg):        self._mediator.sendmsg(msg,self)    def getmsg(self,msg):        print ‘ %s get msg : %s‘ % (self._name,msg)class HouseOwner(Person):    passclass Tenant(Person):    passclass ConcreteMediator(Mediator):    def sethouseowner(self,houseowner):        self._houseowner = houseowner    def settenant(self,tenant):        self._tenant = tenant    def sendmsg(self,msg,person):        if person != self._houseowner:            self._houseowner.getmsg(msg)        else:            self._tenant.getmsg(msg)if __name__ == ‘__main__‘:    mediator = ConcreteMediator()    #house owner find the mediator    houseowner = HouseOwner(‘wang‘,mediator)    #tenant find the mediator    tenant = Tenant(‘li‘,mediator)    #the mediator make the bridge between houser owner and tenant    mediator.sethouseowner(houseowner)    mediator.settenant(tenant)    #houser owner and tenant can contact    tenant.contact(‘any else houses?‘)    houseowner.contact(‘yes!‘)    print ‘over!‘    houseowner1 = HouseOwner(‘chen‘,mediator)    mediator.sethouseowner(houseowner1)    tenant.contact(‘any else houses?‘)    houseowner1.contact(‘yes!‘)    houseowner.contact(‘yes!‘) # not the current houseowner,take as tenant