code: def _get_position(self):
          
          portfolio_code = self.account_config["portfolio_code"]
          portfolio_info = self._get_portfolio_info(portfolio_code)
          position = portfolio_info["view_rebalancing"]  # 仓位结构
          stocks = position["holdings"]  # 持仓股票
          return stocks
docs: 获取雪球持仓
          :return: