类的继承1

1.子类可以继承父类的方法：

 

class People:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def eat(self):
        print("%s is eating.."%self.name)
    def talk(self):
        print("%s is talking.."%self.name)
    def sleep(self):
        print("%s is sleeping.."%self.name)

class Man(People):
    def smoke(self):
        print("%s is smoking..."%self.name)

m1=Man("Jack",18)
m1.eat()
m1.smoke()

 运行结果：

Jack is eating..
Jack is smoking...

 

2.在子类中给父类方法增加新功能。

class People:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def eat(self):
        print("%s is eating.."%self.name)
    def talk(self):
        print("%s is talking.."%self.name)
    def sleep(self):
        print("%s is sleeping.."%self.name)

class Man(People):
    def smoke(self):
        print("%s is smoking..."%self.name)
    def sleep(self):
        People.sleep(self)
        print("子类也在睡觉")
m1=Man("Jack",18)
m1.sleep()

 运行结果如下：相当于给父类的方法增加了新功能。

Jack is sleeping..
子类也在睡觉

 

3.子类之间的方法不能相互调用，women是不能调用man下面的smoke方法的。

class People:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def eat(self):
        print("%s is eating.."%self.name)
    def talk(self):
        print("%s is talking.."%self.name)
    def sleep(self):
        print("%s is sleeping.."%self.name)

class Man(People):
    def smoke(self):
        print("%s is smoking..."%self.name)
    def sleep(self):
        People.sleep(self)
        print("子类也在睡觉")
m1=Man("Jack",18)
m1.sleep()

class Woman(People):
    def shop(self):
        print("%s is shopping"%self.name)

w1=Woman("Lily",26)
w1.shop()

 4.子类中的man可以多传一个参数，同时不要影响women的正常运行。

 

#class People: #经典写法
class People(object):  #新式写法
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def eat(self):
        print("%s is eating.."%self.name)
    def talk(self):
        print("%s is talking.."%self.name)
    def sleep(self):
        print("%s is sleeping.."%self.name)

class Man(People):
    def __init__(self,name,age,money):
        People.__init__(self,name,age)  #super(Man,self).__init__(name,age) #新式写法
        self.money=money
        print("%s有%s钱。。"%(self.name,self.money))
    def smoke(self):
        print("%s is smoking..."%self.name)
    def sleep(self):
        People.sleep(self)
        print("子类也在睡觉")
m1=Man("Jack",18,10000)

class Woman(People):
    def shop(self):
        print("%s is shopping"%self.name)

w1=Woman("Lily",26)
w1.shop()

 运行结果

Jack有10000钱。。
Lily is shopping

 

5.多继承，可以同时继承多个父类：

 

class People:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def eat(self):
        print("%s is eating.."%self.name)
    def talk(self):
        print("%s is talking.."%self.name)
    def sleep(self):
        print("%s is sleeping.."%self.name)
class Relation(object):
    def make_friends(self,obj):
        print("%s is making friend with %s"%(self.name,obj.name))

class Man(People,Relation):
    def __init__(self,name,age,money):
        People.__init__(self,name,age)
        self.money=money
        print("%s有%s钱。。"%(self.name,self.money))
    def smoke(self):
        print("%s is smoking..."%self.name)
    def sleep(self):
        People.sleep(self)
        print("子类也在睡觉")

class Woman(People,Relation):
    def shop(self):
        print("%s is shopping"%self.name)

m1=Man("Jack",22,10000)
w1=Woman("Lily",18)
m1.make_friends(w1)

 运行结果：

Jack有10000钱。。
Jack is making friend with Lily

 

6.多继承的时候，父类是从左到右执行的。class Woman(People,Relation)， 先执行People，再执行 Relation