1 继承：
2 #python2 经典类是按深度优先来继承的，新式类是按广度优先来继承的
3 #python3 经典类和新式类都是按广度优先来继承的
4
5
6
7 #经典类：class People:
8 class People(object): #这个是新式类,多继承的时候有了改变
9
10 def __init__(self, name, age):
11 self.name =name
12 self.age = age
13
14
15 def eat(self):
16 print("%s is eating" % self.name)
17
18
19 def talk(self):
20 print("%s is talking" % self.name)
21
22 def sleep(self):
23 print("%s is sleeping" % self.name)
24
25 #多继承的示范
26 class Relation(object):
27 def make_friends(self, obj):
28 print("%s is making friends with %s" % (self.name, obj.name))
29 self.friends.append(obj) #要用obj，这样才和另一个实例产生联系
30
31 #子类继承
32 class Man(People, Relation): #小括号中 一定要有父类名称，如People
33
34 def __init__(self, name, age, sex="man"):
35 # People().__init__(self,name, age) 第一种的初始化方法
36 super().__init__(name, age) # superclass，super函数直接继承所有，super(Man, self)的省略
37 self.sex = sex
38 self.friends = []
39
40 def working_hard(self):
41 print("earning money.")
42
43 def sleep(self): #重构了父类的方法
44 People.sleep(self)
45 print("Man %s is sleeping" % self.name)
46
47
48 class Woman(People, Relation):
49
50 def __init__(self,name, age, sex = "woman"):
51 super().__init__(name, age)
52 self.sex = sex
53 self.friends = []
54
55 def get_birth(self):
56 print("%s is giving birth to a baby." % self.name)
57
58
59 p1 = People("Adam", 26)
60 p1.eat()
61 print("%s is %s years old." % (p1.name, p1.age))
62 p1.sleep()
63
64 m1 = Man("Alex", 28)
65 m1.eat()
66 m1.working_hard()
67 m1.sleep()
68 m1.make_friends(p1)
69 print(m1.friends[0].name)
70
71 w1 = Woman("Shell", 27)
72 w1.get_birth()
73 w1.sleep()
