构建一个商品类，__init__函数类似于构造方法，self类似于this

import random
class Goods:
    def __init__(self, name, price):
        self.name = name
        self.price = price

    def changeprice(self, m, n):
        self.price = random.randint(m, n)
        return self.price

再写一个商店类，用于存放商品

class Gshop:
    goodslist = []
    def __init__(self, g):
        self.goodslist.append(g)

    def add(self, g):
        self.goodslist.append(g)

    def changegoodslistprice(self):
        for w in self.goodslist:
            w.changeprice(20, 50)
            print(w.name, w.price)

实例化对象，执行对象的方法

import goods,gshop
toy = goods.Goods(‘洋娃娃‘, 30)
gshopdemo = gshop.Gshop(toy)
#print(toy.name, toy.price)

car_wlhg = goods.Goods(‘五菱宏光‘, 30000)
gshopdemo.add(car_wlhg)
gshopdemo.changegoodslistprice()

运行结果：

python之类和__init__