python之类和__init__

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：