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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def __setRouterUpgradeThreshold(self, iThreshold):
 """set router upgrade threshold Args: iThreshold: the number of active routers on the Thread network partition below which a REED may decide to become a Router. Returns: True: successful to set the ROUTER_UPGRADE_THRESHOLD False: fail to set ROUTER_UPGRADE_THRESHOLD """

        print 'call __setRouterUpgradeThreshold'
        try:
            cmd = 'routerupgradethreshold %s' % str(iThreshold)
            print cmd
            return self.__sendCommand(cmd) == 'Done'
        except Exception, e:
            ModuleHelper.WriteIntoDebugLogger("setRouterUpgradeThreshold() Error: " + str(e))