@property
def buy_pnl(self):
    '\n        [float] 买方向累计盈亏\n        '
    return (((self.last_price - self._buy_avg_open_price) * self.buy_quantity) * self.contract_multiplier)
[float] 买方向累计盈亏
@property
def buy_pnl(self):
    '\n        \n        '
    return (((self.last_price - self._buy_avg_open_price) * self.buy_quantity) * self.contract_multiplier)