一、类的继承

例：

1 import random as  r 2 class Fish(): 3     def __init__(self): 4         self.x=r.randint(0,10) 5         self.y=r.randint(0, 10) 6     def move(self): 7         print("现在的位置是：" ,self.x,self.y) 8 class Goldfish(Fish): 9     pass10 class Shark(Fish):11     def __init__(self):12         super().__init__()13         self.hungry=True14     def eat(self):15         if self.hungry:16             print("我在吃东西，肚子好饿")17             self.hungry=False18         else:19             print("好饱，吃不下了，呜呜")20 fish=Fish()21 fish.move()22 goldfish=Goldfish()23 goldfish.move()24 shark=Shark()25 shark.move()26 shark.eat()27 shark.eat()

二、类的多重继承

例：

class Base1:    def Fun1(self):       print("我是Fun1，我是Base1的方法")class Base2:    def Fun2(self):       print("我是Fun2，我是Base2的方法")class User(Base1,Base2):    passclient=User()client.Fun1()client.Fun2()

三、类的组合

例：

class Fish:    def __init__(self,x):        self.num=xclass Wugui:    def __init__(self, x):        self.num = xclass Pool:    def __init__(self,x,y):        self.wugui=Wugui(x)        self.fish=Fish(y)    def print_num(self):        print("水池里面一共有乌龟%d 只，小鱼%d 条 "  % (self.wugui.num,self.fish.num))pool=Pool(1,3)pool.print_num()