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 pass
10 class Shark(Fish):
11 def __init__(self):
12 super().__init__()
13 self.hungry=True
14 def eat(self):
15 if self.hungry:
16 print("我在吃东西，肚子好饿")
17 self.hungry=False
18 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):
pass
client=User()
client.Fun1()
client.Fun2()
三、类的组合
例：
class Fish:
def __init__(self,x):
self.num=x
class Wugui:
def __init__(self, x):
self.num = x
class 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()
