```# # 经典类VS新式类class person(object): #这就是新式类 pass #super(Teacher,self).__init__(name,age,sex) # 新式类写法class Person: #这就是经典类 pass #School.__init__(self,name,age,sex) #经典类写法## 新式类（先从左往右找，B没有就找C，C没有就找A！这种查询叫广度查询，先查完B,C这一层，再去查A层）class A(object): def __init__(self): self.n="A"class B(A): pass #def __init__(self): #self.n="B"class C(A): def __init__(self): self.n="C"class D(B,C): pass # def __init__(self): # self.n="D"d=D()print(d.n)## 经典类（经典类在python2中先找B，B没有就去找A！这叫深度查询，如果A里没找到就去找C）（新式类和经典类在pythin3中都是广度查询！）class A: def __init__(self): self.n="A"class B(A): #pass #def __init__(self): #self.n="B"class C(A): #pass def __init__(self): self.n="C"class D(B,C): pass #def __init__(self): #self.n="D"d=D()print(d.n)# 多态class Animal(object): def __init__(self, name): # Constructor of the class self.name = name def talk(self): # Abstract method, defined by convention only raise NotImplementedError("Subclass must implement abstract method")class Cat(Animal): def talk(self): #重新定义talk print('%s: 喵喵喵!' % self.name)class Dog(Animal): def talk(self): #重新定义talk print('%s: 汪！汪！汪！' % self.name)def func(obj): # 一个接口，多种形态（传入不同的实例，调用的接口都是talk，单表达方式不同） obj.talk()c1 = Cat('小晴')d1 = Dog('李磊')func(c1)func(d1)