code: def __appendActivities(self, periodicActivities):
      
  
      for req in periodicActivities:
        act =   self.Activity(repeating=req.repeating,
                              period=req.period,
                              cb=req.cb,
                              iteratorHolder=[iter(xrange(req.period-1))])
        self.__activities.append(act)
  
      return
docs: periodicActivities: A sequence of PeriodicActivityRequest elements