OOP Python將一些屬性添加到基類中？

Question

我在學習使用Python與小型控制檯應用程序.trying OOP Stock

class Stock(object): 

    def __init__(self, stockName, stockLimit, inStock, rentPrice): 

     self.stockName = stockName # private 
     self.stockLimit = stockLimit # private 
     self.inStock = inStock  # private 
     self.rentPrice = rentPrice # private 

    def inputStock(self, nProduct): 

     if(nProduct >= (self.stockLimit - self.inStock)): 
      self.inStock = self.stockLimit 
     else: 
      self.inStock += nProduct 

    def invoice(self, nDay): 
     return self.rentPrice * nDay 


class StockProduct(Stock): 

    def __init__(self, factor): 
     # the base-class constructor: 
     Stock.__init__(self, stockName, stockLimit, inStock, rentPrice) 
     self.factor = factor # Extra for this stock 

    def invoice(self, nDay): 
     return Stock.invoice(self, nDay) * self.factor 

class StockMaterial(Stock): 

    def __init__(self,factor): 
     # the base-class constructor: 
     Stock.__init__(self, stockName, stockLimit, inStock, rentPrice) 
     self.factor = factor # Extra for this stock 

    def invoice(self,nDay): 
     return Stock.invoice(self, nDay)*self.factor 

if __name__ == "__main__": 

    N = nDay = 0 
    myStock = Stock("stock111", 500, 200, 400000) 
    N = float(raw_input("How many product into stock: "+str(myStock.stockName)+" ? ")) 
    myStock.inputStock(N) 
    nDay = int(raw_input("How many days for rent : "+str(myStock.stockName)+" ? ")) 
    print "Invoice for rent the stock: "+str(myStock.stockName)+ " = "+ str(myStock.invoice(nDay)) 

    StockProduct = StockProduct("stock222",800, 250, 450000, 0.9) 

    N = float(raw_input("How many product into stock: "+str(StockProduct.stockName)+" ? ")) 
    StockProduct.inputStock(N) 
    nDay = int(raw_input("How many days for rent : "+str(StockProduct.stockName)+" ? ")) 
    print "Invoice for rent the stock: "+str(StockProduct.stockName)+ " = "+ str(StockProduct.invoice(nDay)) 

我有兩個問題：

1. 用我的方法invoice，我該怎麼辦方法重載的蟒蛇？

2. 我加在孩子的一些屬性，我得到了以下錯誤消息：

   StockProduct = StockProduct("stock222",800, 250, 450000, 0.9) 
   TypeError 
   
   error: __init__() takes exactly 2 arguments (6 given) 
   

我應該做的是什麼？

有人可以幫我嗎？

預先提前感謝

Answer 1

1. 派生類中的重載invoice應該正常工作。

2. 你的基類的構造函數需要有所有的參數，所以：

   class StockProduct(Stock): 
       def __init__(self, stockName, stockLimit, inStock, rentPrice, factor): 
        # the base-class constructor: 
        Stock.__init__(self, stockName, stockLimit, inStock, rentPrice) 
        self.factor = factor 
   
       def invoice(self, nDay): 
        return Stock.invoice(self, nDay) * self.factor 
   

Answer 2

1 - 是的，你可以在python中做方法重載。

2 - 您的孩子班級更改了方法簽名。如果你想從父類加一些額外的所有的參數來構建它，你應該把它聲明爲

def __init__(self, stockName, stockLimit, inStock, rentPrice, factor): 

。