获取账户资金状况
        :return:

def get_balance(self):
        """
        获取账户资金状况
        :return:
        """
        portfolio_code = self.account_config.get("portfolio_code", "ch")
        portfolio_info = self._get_portfolio_info(portfolio_code)
        asset_balance = self._virtual_to_balance(
            float(portfolio_info["net_value"])
        )  # 总资产
        position = portfolio_info["view_rebalancing"]  # 仓位结构
        cash = asset_balance * float(position["cash"]) / 100
        market = asset_balance - cash
        return [
            {
                "asset_balance": asset_balance,
                "current_balance": cash,
                "enable_balance": cash,
                "market_value": market,
                "money_type": u"人民币",
                "pre_interest": 0.25,
            }
        ]