@property
def pnl(self):
    '\n        [float] 累计盈亏\n        '
    return (self.buy_pnl + self.sell_pnl)
[float] 累计盈亏
@property
def pnl(self):
    '\n        \n        '
    return (self.buy_pnl + self.sell_pnl)