Python 类和 init_ 构造函数，如何创建列表变量？

Question

您好，我正在创建一个包含购物清单的 class。该代码似乎有效，但我不确定我是否正确执行。我是想把 shopping = [] 放在构造函数中，那有什么作用？非常感谢

class Shopping:
    def __init__(self, shopping = []): 
        self.__shopping = []

   
    def set_shopping(self, shopping): 
          self.__shopping  = shopping
    def get_shopping(self): 
        return self.__shopping

shoppinglist = Shopping()
shoppinglist = ['apples', 'pears', 'bread']

Answer 1

这是一个例子：

class Shopping:
    def __init__(self, shopping = []): 
        self.__shopping = []
    
    def set_shopping(self, shopping): 
          self.__shopping  = shopping
    
    def get_shopping(self): 
        return self.__shopping
    
    def add_article(self, article): 
          self.__shopping.append(article)

    def get_article(self, index): 
          return self.__shopping[index]

    shoppinglist = Shopping()
    shoppinglist.set_shopping(['apples', 'pears', 'bread'])
    shoppinglist.add_article('oranges')
    shoppinglist.get_article(0) #==> 'apples'
    shoppinglist.get_article(3) #==> 'oranges'

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