How to build on last order to further execute orders?

Zoutain Ye

basically I want to check the last buy order, if current close is larger than last execution, we buy another 50% in from the rest of cash. but no more than 3 times.
The command wont execute, I know it could to be something like

order.executed.price[0]

but I couldn't find a right expression for it:

def next(self):
        self.count = 0
        if not self.position:
            if self.datahigh[0]>self.upper:
                dif =self.short - self.long
                if dif > 0:
                    self.order = self.order_target_percent(target=0.5)

        else:
            if self.datalow[0] < self.lower:
                dif = self.short - self.long
                if dif < 0:
                    self.order = self.close()

            elif self.data.close[0] < self.short*0.90:
                self.order = self.close()

            elif self.close[0] > order.executed.price[0]*1.5:
                if self.count < 4:
                    self.order = self.order_target_percent(target=0.5)
                    self.count += 1
                    self.order = self.order_target_percent(target=0.5)