@property
def sell_quantity(self):
    '\n        [int] 卖方向持仓\n        '
    return (self.sell_old_quantity + self.sell_today_quantity)
[int] 卖方向持仓
@property
def sell_quantity(self):
    '\n        \n        '
    return (self.sell_old_quantity + self.sell_today_quantity)