实现一个购物车类

[python]代码库

class Item:
    def __init__(self,name,**kwargs):
        self.name = name
        self._spec = kwargs

    def __repr__(self):
        return '{} = {}'.format(self.name,self._spec)


class Cart:
    def __init__(self):
        self.items = []


    def __len__(self):
        return len(self.items)

    def additem(self,item):
        self.items.append(item)

    def __add__(self, other):  # +
        print(other)
        self.items.append(other)
        return self

    def __getitem__(self, index):  #index
        return self.items[index]

    def __setitem__(self, key, value):
        print(key,value)
        self.items[key] = value
        # self[key] = value

    def __iter__(self):
        return iter(self.items)

    # def __missing__(self, key):
    #     print("key="+key)

    def __repr__(self):
        return str(self.items)

cart = Cart()