如何通过我的方法增加属性值？ （蟒蛇）

Question

我想我update_number_served方法添加到我的increment_number_served方法在我的代码。我与一般的类很困惑在这一点上，但经过一番google搜索，我似乎无法在这里找到答案，因为我很新的蟒蛇和计算器：

class restaurant(): 
""" 
A simple attempt to state a restaurant cuisine type and if it is open 
using classes and functions 
""" 

    def __init__(self,restaurant_name,cuisine_type): 
     """Initialize name and age attributes.""" 
     self.restaurant_name = restaurant_name 
     self.cuisine_type = cuisine_type 
     self.number_served = 0 

    def describe_restaurant(self): 
     """Simulate the restaurant cuisine type""" 
     print(self.restaurant_name.title() + " contains " + self.cuisine_type.title() + " food.") 

    def open_restaurant(self): 
     """Simulate the restaurant open""" 
     print(self.restaurant_name.title() + " is now open!") 

    def update_number_served(self, number): 
     self.number_served = number 
     print("This restaurant has served " + str(number) + " customers.") 

    def increment_number_served(self, number): 
     self.number_served += number 
     print("With a total of " + str(number)) 

restaurant_kravins = restaurant("Kravins", "jamaican") 

restaurant_kravins.describe_restaurant() 
restaurant_kravins.open_restaurant() 
restaurant_kravins.update_number_served(10) 
restaurant_kravins.increment_number_served(8) 

Answer 1

其实，你应该打印self.number_served代替的number的，number是数递增，这里self.number_served += number相当于self.number_served = self.number_served + number。

def increment_number_served(self, number): 
    self.number_served += number 
    print("With a total of " + str(self.number_served)) 

对于之前它self.属性，它们是“看得见”到处class内。所以你可以从另一种方法实际更新它。像在这种情况下一样，self.number_served最初在__init__中初始化，并在update_number_served中分配了一个值;并最终在increment_number_served更新。

因此，实际上，在您拨打restaurant_kravins.increment_number_served(8)后，属性self.number_served已被更新。您也可以通过以下方式查看它：

print('Total number served: ', restaurant_kravins.number_served)