获取雪球持仓
        :return:

def _get_position(self):
        """
        获取雪球持仓
        :return:
        """
        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