42.继承

被继承的是父类、基类
通过继承创建的类是 子类或者派生类

最简单的继承

class School_member(object):
    def __init__(self,name,age,sex):  #构造函数
        self.name = name
        self.age = age
        self.sex = sex


    def talk(self):
        info = """
        ---------%s---------
        my name is %s
        my age  is %s
        my sex  is %s         
        """%(self.name,self.name,self.age,self.sex)
        print(info)


class Teacher(School_member):  #继承
    pass


A = Teacher("dailiang",23,"male")
A.talk()

子类也可以有自己的方法：

class School_member(object):
    def __init__(self,name,age,sex):  #构造函数
        self.name = name
        self.age = age
        self.sex = sex

    def talk(self):
        info = """
        ---------%s---------
        my name is %s
        my age  is %s
        my sex  is %s         
        """%(self.name,self.name,self.age,self.sex)
        print(info)

class Teacher(School_member):  #继承
    def teching(self):
        print("%s is teaching python" %self.name)

A = Teacher("dailiang",23,"male")
A.teching()       #dailiang is teaching python

子类增加参数：

class School_member(object):
    def __init__(self,name,age,sex):  #构造函数
        self.name = name
        self.age = age
        self.sex = sex


    def talk(self):
        info = """
        ---------%s---------
        my name is %s
        my age  is %s
        my sex  is %s         
        """%(self.name,self.name,self.age,self.sex)
        print(info)


class Student(School_member):     
    def __init__(self, name, age, sex,amount):  # #如果继承之后，要增加新的属性，需要把父类的参数也添加上
        School_member.__init__(self,name,age,sex)  #继承父类的参数
        #也可以这样写super(Student, self).__init__(name, age, sex)
        self.amount = amount


A = Student("gangsi",73,"male",10000)

print(A.amount) #10000
print(A.talk())

重构父类方法：

class School_member(object):
    def __init__(self,name,age,sex):  #构造函数
        self.name = name
        self.age = age
        self.sex = sex

    def talk(self):
        info = """
        ---------%s---------
        my name is %s
        my age  is %s
        my sex  is %s         
        """%(self.name,self.name,self.age,self.sex)
        print(info)


class Student(School_member):
    def __init__(self, name, age, sex,amount):
        super(Student, self).__init__(name, age, sex)
        self.amount = amount

    def talk(self):                               #overwriten 重构了父类的talk方法
        print("%s is teaching python,she's amount is %s"%(self.name,self.amount))

A = Student("gangsi",73,"male",10000)  

print(A.amount) #10000
print(A.talk())  ##gangsi is teaching python,she's amount is 10000

多继承

class Animal(object):
    def sleep(self):
        print("---------sleep---------")
    def eat(self):
        print("-------eat-------------")

class horse(Animal):
    def run(self):
        print("-------run fast-------")

class lv(Animal):
    def work(self):
        print("-------work hard----")

class luozi(horse,lv):   #多继承
    pass

A = luozi()  
print(A.run())   # -------run fast-------
print(A.work())  #-------work hard----