code: def __setUpTrakers(self):
          ''' set securities '''
          for security in self.securities:
              self.__trakers[security]=OneTraker(security, self, self.buying_ratiof __setUpTrakers(self):
          ''' set securities '''
          for security in self.securities:
              self.__trakers[security]=OneTraker(security, self, self.buying_ratio)
docs: set securities