9.Classes

class people:
    name = ''
    age = 0
    #定义私有属性,私有属性在类外部无法直接进行访问
    __weight = 0
    #定义构造方法
    def __init__(self,n,a,w):
        self.name = n
        self.age = a
        self.__weight  = w
    def speak(self):
        print("%s 说： 我 %d 岁。"%(self.name,self.age))

p = people('runoob',10,30)
p.speak()


#单继承示列
class student(people):
    grade = ' '
    def __init__(self,n,a,w,g):
        #调用父类的构造函数
        people.__init__(self,n,a,w)
        self.grade = g
    #覆写父类的方法
    def speak(self):
        print("%s 说： 我%d岁了，我在读%d年级"%(self.name,self.age,self.grade))

# 另一个类，多重继承之前的准备
class speaker():
    topic = ''
    name = ''
    def __init__(self,n,t):
        self.name = n
        self.topic = t
    def speak(self):
        print("我叫 %s,我是一个演说家，我演讲的主题是%s"%(self.name,self.topic))

#多重继承
class sample(speaker,student):
    a = ''
    def __init__(self,n,a,w,g,t):
        student.__init__(self,n,a,w,g)
        speaker.__init__(self,n,t)

test = sample("Tim",25,80,4,"Python")
test.speak()