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课程。该代码似乎有效，但我不确定我是否正确执行。我是否打算将 Shopping = [] 放入构造函数中，那有什么作用？提前谢谢了class Shopping:    def __init__(self, shopping = []):         self.__shopping = []       def set_shopping(self, shopping):           self.__shopping  = shopping    def get_shopping(self):         return self.__shoppingshoppinglist = 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'