Python之面向对象学习2

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)
        if isinstance(other, Item):
            self.items.append(other)
        return self

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

    def __iter__(self):
        return iter(self.items)  # cart对象变为迭代器

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



cart = Cart()
print(cart+2+3+4+5)  # 运算符重载