@property
def buy_holding_pnl(self):
    '\n        [float] 买方向当日持仓盈亏\n        '
    return (((self.last_price - self.buy_avg_holding_price) * self.buy_quantity) * self.contract_multiplier)
[float] 买方向当日持仓盈亏
@property
def buy_holding_pnl(self):
    '\n        \n        '
    return (((self.last_price - self.buy_avg_holding_price) * self.buy_quantity) * self.contract_multiplier)